Problems and solutions in mathematical olympiad pdf - The problems given in the IMO are largely designed to require creativity and the ability to solve problems.

 
International Mathematical Olympiad. . Problems and solutions in mathematical olympiad pdf

: il. The Authors v f Part I Problems and Solutions 1 f2 fThe 1st BMO The first Balkan Mathematical Olympiad for high-school students was held between May 6 *u001f and May 10 *u001f , 1984, in Athens, Greece. The main topics are. 7 = 2 x 5 — 1 x 3. In each chapter, well-designed problems including those collected from real competitions are provided so that the students can apply the skills and strategies they have learned to. Comprehending as with ease as promise even more than extra will pay for each. Suppose m+ jhas less than ndistinct prime factors. Finally, though this note is aimed for students participating in the Bangladesh Mathematical. Given that 21025 = x2, try to find the value of according to the above rules. 45th Canadian Mathematical Olympiad Wednesday, March 27, 2013 Problems and Solutions 1. 2020 Australian Mathematical Olympiad Solutions AUSTRALIAN MATHEMATICAL OLYMPIAD 2020 Solutions 2020 Australian Mathematics Trust 1. As a feature of the series, we also include some solutions generously offered by the members of Chinese national. Problems and Solutions in Mathematical Olympiad High School 3 https://doi. Students who perform well qualify for the next round (50-60 points are usually enough). Most solutions to this problem first prove that f must be linear, before. MOEMS Division M Problems 2010-2011 with Solutions and Answers: 749. in Mathematical Olympiads. y to learn mathematics is to do mathematics. area mathematical olympiad problems and solutions - 19th bay area mathematical olympiad february. জিও ১ম ও ২ইয় ক্লাসের pdf link-. Problems and Solutions. Load more similar PDF files. Mathematical Olympiad have contained some interesting problems about polynomials. com ✓ FREE . International Mathematical Olympiad. This book is a continuation Mathematical Olympiads 1995-1996: Olympiad Problems from Around the World, published by the American Mathemat- ics Competitions. Addeddate 2018-07-03 06:34:45 Identifier MathematicalOlympiadInChinaProblemsAndSolutions Identifier-ark ark:/13960/t5s82bx9d Ocr ABBYY FineReader 11. Suppose m+ jhas less than ndistinct prime factors. May he rest in peace! Solution by Boris 33. 45th Canadian Mathematical Olympiad Wednesday, March 27, 2013 Problems and Solutions 1. 1995 Russian Math Olympiad Is it possible to nd three quadratic. In mathematics, there are many different types of problems. Prove that there exist in nitely many integers msuch that. This pdf contains 20 challenging math problems for grade 5 students who want to prepare for the IJMO competition. Fully peer-reviewed solutions by academic/professional mathematicians are included. Concepts and Properties of Trigonometric. Math Contest Problems. Maths Olympiad Contest Problems Volume 3 Australian Edition Exploring Maths Through Problem Solving Contains APSMO Maths Olympiad Papers From 2006 to 2013 Contents Olympiad Problems: Division J: Sets 1 - 8 23 Olympiad Problems: Division S: Sets 9 - 16 65 Hints 107. Solution 1: The answer is P (x) being any constant polynomial and P (x) ≡ kx2 +kx+c for any (nonzero) constant k and constant c. The problems given in the IMO are largely designed to require creativity and the ability to solve problems. Problem 2 Best books for PRMO, RMO, INMO, Maths Olympiads | Best book in Mathematics | Books. (This problem was proposed by Kiran Kedlaya. Author(s) Bin Xiong, Yee Lee Peng ; Publisher: World Scientific Publishing Company (June 20, 2007) ; Hardcover: 276 pages ; eBook: PDF, 273 pages, 8. In 2019, he was awarded the Best Educator of the Year in all of China. It is a collection of. The International Mathematical Olympiad. The authors have collected olympiad problems from the national contests of 22 different countries, together with 5 regional contests from 2000 and the national contest of 16. 45th Canadian Mathematical Olympiad Wednesday, March 27, 2013 Problems and Solutions 1. Prove that for all natural numbers n 3 there exist odd natural numbers x n;y nsuch that 7x2 + y2 = 2n. Gilbert, and Loren C. This book is a continuation Mathematical Olympiads 1995-1996: Olympiad. George Lenchner (400 problems, Division E) Math Olympiad Contest Problems Volume 2 edited by Richard Kalman (250 problems, Division E and 175 problems, Division M). Determine all polynomials P(x) with real coefficients such that (x+1)P(x−1)−(x−1)P(x) is a constant polynomial. My understanding is that the internal problems and solutions, from the actual USA(J)MO committee, are copyrighted by MAA. Balkan Mathematical Olympiad 2014 - Free download as PDF File (. Determine all polynomials P (x) with real coefficients such that (x+1)P (x−1)− (x−1)P (x)is a constant polynomial. Click here to view our Problem of the Week. Larson Problems from Murray Klamkin: The Canadian Collection, edited by Andy Liu and Bruce Shawyer Trigonometry: A Clever Study Guide, by James Tanton The William Lowell Putnam Mathematical Competition Problems and Solutions: 1938–. It has played a significant role in generating wide interest in mathematics among high school students, as well as identifying talent. Readership: Secondary school students engaged in mathematical competition, coaches in mathematics teaching, and teachers setting up math elective courses. International Mathematical Olympiad. International Mathematical Olympiad Team. com> January 31, 2020 Abstract This is a series of papers centralized around International Mathe- matical Olympiad (IMO). Math Olympiad Books Pdf Free Download. Find the smallest real constant Csuch that for any positive real numbers a 1;a 2;a 3;a 4 and a 5 (not necessarily distinct), one can always choose distinct subscripts i;j. The International Mathematical Olympiad (IMO) Logos from the International Math Olympiad 1988, 1991-1996, 1998-2004 (I omitted 1997's logo which I find rather dull). Mathematical Olympiad Challenges. Example 1. Preparing for mathematical olympiad or mathematical competitions? Check out these books, from beginner to advanced level, covering a variety of topics from number theory to geometry. It is suitable for high school pupils (Grade 7 to. The problems (which are never trivial) naturally progress in difficulty and, in the book, are immediately followed by solutions, often more than one. About the Contest: The International Math Contest is a 30-minute Online Challenge based on leading math curricula from across the world. Each year on the first Saturday in December, several thousand US and Canadian students spend 6 hours (in two sittings) trying to solve 12 problems. Determine the smallest real number ansuch that, for all real x, N c x2N`1 2 ď anpx´1q2`x. Preface 6 PREFACE. The Canadian Junior Mathematical Olympiad ( CJMO ), also by invitation only, is held at the same time for students up to grade ten. MINISTRY OF EDUCATION AND SCIENCE OF RUSSIAN FEDERATION SAMARA STATE UNIVERSITY arXiv:1110. In addition, the book contains all the available longlist problems, for a total of more than #&&& problems. If you ally infatuation such a referred Mathematical Olympiad Problems And. info modified 11/28/2015. – Spec. 50: 561–565. These are some handouts I’ve written over the years. The Hard Mathematical Olympiad Problems and Their Solutions 2014-06-28 This is a book on Olympiad Mathematics with detailed and elegant. Basic Inequalities Page: 403 10. Hence there exist t, 1 t rsuch that p t t. The Authors v f Part I Problems and Solutions 1 f2 fThe 1st BMO The first Balkan Mathematical Olympiad for high-school students was held between May 6 *u001f and May 10 *u001f , 1984, in Athens, Greece. Determine all polynomials P(x) with real coefficients such that (x+1)P(x−1)−(x−1)P(x) is a constant polynomial. To contribute problem solutions for 1989. 1 Introduction This is a personal compilation of solutions to International Mathematical Olympiad problems. 4 or the treatment of generating functions in Section 4. 1 1996 National Contests: Problems and Solutions 1. IOQM 2020 – Answer Key. Author: Titu Andreescu | Razvan Gelca. The answer to any math problem depends on upon the question being asked. Sample PDF of IMO for Class 7. Each level has a differentiated paper and contains 25 questions within 2 sections: Section A: Multiple Choice Questions and Section B: Non-routine Questions. 5 E. Senior Division. You can find problems on algebra, combinatorics, geometry, number theory and more. Download file. the international math communities support our efforts for using these bril-liant problems and solutions to attract our young students to mathematics. 7 = 2 x 5 — 1 x 3. It contains solutions to the problems from 27 national and regional contests featured in the earlier book, together with selected. Math Olympiad Books Pdf Free Download is a book of problems and solutions, and perhaps the best book for solving problems. The solution set of. Mathematical Olympiad Solutions USAMO 1. The series is edited by the head coaches of China's. The Authors v f Part I Problems and Solutions 1 f2 fThe 1st BMO The first Balkan Mathematical Olympiad for high-school students was held between May 6 *u001f and May 10 *u001f , 1984, in Athens, Greece. The AMC 8 is the hardest of the three math competitions on this list. Solutions to some selected problems are given in the last chapter to present di erent strategies and techniques of solving inequality problems. The International Mathematical Olympiad (IMO) Logos from the International Math Olympiad 1988, 1991-1996, 1998-2004 (I omitted 1997's logo which I find rather dull). ,k2 +2k +1}. Aleksa Konstantinov Math High School, Belgrade 14 points Nikola Sadovek Math High School, Belgrade 14 points In this booklet we present the problems and full solutions of the Serbian Math-ematical Olympiad, team selection test and the Balkan Mathematical Olympiad. Singapore math olympiad questions and solutions pdf The International Mathematical Olympiad (IMO) is the most important and prestigious math- ematical competition for high-school students. even number, so the functions identi ed in the beginning of the solution are actually the only solutions to the equation. Speed is not important! As you become more experienced with different strategies, mathematical ideas and principles, and develop your skills, the amount of time you need to do a problem will decrease naturally. 45th Canadian Mathematical Olympiad Wednesday, March 27, 2013 Problems and Solutions 1. Singapore math olympiad questions and solutions pdf The International Mathematical Olympiad (IMO) is the most important and prestigious math- ematical competition for high-school students. Solution 1: The answer is P (x) being any constant polynomial and P (x) ≡ kx2 +kx+c for any (nonzero) constant k and constant c. He was the leader of the Chinese national team in the International Mathematical Olympiad (2009), and member of the Problem Committee of the Chinese Mathematical Olympiad (2005–2016). Problems and Solutions in Mathematical Olympiad. " (Mehdi Hassani, The Mathematical Association of America, June, 2009). The AIME I and II are a 15-question, three-hour competition, where each answer is an integer between 000 and 999, inclusive. This book is a continuation Mathematical Olympiads 1995-1996: Olympiad Problems from Around the World, published by the American Mathemat- ics Competitions. Solution 1 (Chris Wetherell) Without loss of generality, we assume that a ≥ b. You can check your answers in our Solutions document. Solution 1 (Chris Wetherell) Without loss of generality, we assume that a ≥ b. The six students China has sent every year were selected from 60. 50: 561–565. The William Lowell Putnam Mathematics Competition is a North American math contest for college students, organized by the Mathematical Association of America (MAA). Math Central Large collection of resources for math students and teachers. For a given positive integer k find, in terms of k, the minimum value of N for which there is a set of 2k + 1 distinct positive integers that has sum greater than N but every subset of size k has sum at most N/2. Problems and Solutions in Mathematical Olympiad High School 1 https://doi. The basic concepts of functional equations and techniques of problem solving have. y to learn mathematics is to do mathematics. Seven white and. Sample PDF of IMO for. Winning solutions (math olympiad problem book). Comprehending as with ease as promise even more than extra will pay for each. The set {k2 +1,k2 +2,. ,k2 +2k +1}. Notices of the American Mathematical Society. So you'd be better prepared for math tests and life in general. Preparing the 6th Grade Math Olympiad Problems to entry every daylight is okay for many people. Find the minimum possible value of a 1 1 + a 2 1 + a 1 + a 3 1 + a 1 + a 2 + + a n 1 + a 1 + a 2 + + a n 1: Solution. Prove that there exist in nitely many integers msuch that. area mathematical olympiad problems and solutions - 19th bay area mathematical olympiad february. Singapore and Asian Schools Math Olympiad SASMO is devoted and dedicated to bringing a love for Mathematics to students. The six highest scoring candidates are invited to attend. Mathematical Olympiad Challenges. Each level has a differentiated paper and contains 25 questions within 2 sections: Section A: Multiple Choice Questions and Section B: Non-routine Questions. BASIC TERMS Sum, difference, product, quotient, remainder, ratio, square of a number (also, perfect square), factors of a number. 3%) on the miniF2F benchmark, a challenging collection of high-school olympiad problems. Singapore Mathematical Olympiad Past Papers 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005. Basic Inequalities Page: 403 10. Canadian Mathematical Olympiad 1969-1993 (Problems and Solutions) - Michael Doob. The purp oses of the b o ok are to exp ose y ou to man yin teresting and useful mathematical ideas, to dev elop y. 1M: pdf: MOEMS Division M Problems 2014-2015 with Solutions and Answers: 2. It started as the Inter-School Mathematical Competition in the mid-1950. Mathematical Olympiad. The schedule for INMO 2021 is Sunday, March 7, 2021, from 12:00 – 16:00 hrs. This problem was proposed by Evan Chen. SASMO is open to all Primary 2 to 6 and Secondary 1 to 4 students (Grade 2 to 10 students from International schools). 2019 U. In this b o ok, y ou will nd man y math problems, ranging from simple to c hallenging problems. We would like to show you a description here but the site won’t allow us. SASMO is open to all Primary 2 to 6 and Secondary 1 to 4 students (Grade 2 to 10 students from International schools). The APMO is a mathematics competition for the Pacific-Rim Region. geometry problems from Middle European Mathematical Olympiad (MEMO) with aops links in the names. Download Problems And Solutions In Mathematical Olympiad High School 3 Book in PDF, Epub and Kindle. Click here to view our Problem of the Week. Here is a solution to all national Mathematical. International Mathematics Olympiad (IMO, also known as the International Mathematical Olympiad) is an annual mathematics competition for high school students [ IMO Article in Wikipedia ]. g here. In conclusion, I have tried to explain that inequalities can be overcome through practice and more practice. Most of the problems have been used in practice sessions for students participated in the Hong Kong IMO training program. Y ou ma y not succeed in solving all the problems. 𝑥> 1 3. 29 thg 3, 2022. We also use the directly computed values a 1 =a 2 =2;a 3 =a 4 =3: (2) First solution. IMO2019 Shortlisted Problems with Solutions Shortlisted Problems (with solutions) 60thInternational Mathematical Olympiad Bath — UK, 11th-22nd July 2019 Note of Confidentiality The Shortlist has to be kept strictly confidential until the conclusion of the following International Mathematical Olympiad. To be accepted, an answer must be consistent with both this document and the wording of the problem. the international math communities support our efforts for using these bril-liant problems and solutions to attract our young students to mathematics. External links. It was renamed Singapore Secondary Schools Mathematics Competitions (for the Secondary Section) and the Singapore Mathematical Olympiad from the late 1980's. Answer Key to. 9 MB ; Language . The test was conducted in SMA Negeri 1. Canadian Mathematical Olympiad 1969-1993 (Problems and Solutions) - Michael Doob. 3M: pdf: MOEMS Division M Problems 2018-2019 with Solutions and Answers: 1. Problem Books is a series of the Mathematical Association of America consisting of collections of problems and solutions from annual mathematical competitions; compilations of problems (including unsolved problems) specific to particular branches of mathematics; books on the art and practice of problem solving, etc. The set {k2 +1,k2 +2,. √ 4 −b ± b2 − ac = x1,2 2. Page 5. And some will ask you to prove that a certain statement is true (or indeed false)! The first type of problem is very familiar to you. Pablo Soberón. Math Olympiad Contest Problems for Elementary and Middle Schools by Dr. Author(s) Bin Xiong, Yee Lee Peng ; Publisher: World Scientific Publishing Company (June 20, 2007) ; Hardcover: 276 pages ; eBook: PDF, 273 pages, 8. If you have. The International Mathematical Olympiad (IMO) is a competition for high school students. ) Nick's Mathematical Puzzles-- Challenging problems with hints and solutions. Sample PDF of IMO for Class 1. is a positive integer. International mathematical olympiad problems and solutions pdf The International Mathematical Olympiad is the pinnacle of all high school mathematics. Section B. 6th Bay Area Mathematical Olympiad. Math Central Large collection of resources for math students and teachers. Math Olympiad Contest Problems for Elementary and Middle Schools by Dr. Consequently, if we can. Determine all polynomials P(x) with real coefficients such that (x+1)P(x−1)−(x−1)P(x) is a constant polynomial. As a feature of the series, we also include some solutions generously offered by the members of. Junior (years 7-8) practice questions and solutions to prepare for the 2019 AMC. Problems from 2000 are published with solutions, but the solutions for 2001 problems are notincluded. Find the minimum possible value of a 1 1 + a 2 1 + a 1 + a 3 1 + a 1 + a 2 + + a n 1 + a 1 + a 2 + + a n 1: Solution. Write M+ j= p 1 1 p 2 2 p r r; r<n: But M+j>nn 1. touch of luxure

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1970 IMO <b>Problems</b>/<b>Problem</b> 2. . Problems and solutions in mathematical olympiad pdf

Synthetic Problems. Solution 1: The answer is P(x) being any constant polynomial and P(x) ≡ kx2 +kx+c for any (nonzero) constant k and constant c. com ✓ FREE . Problem 149 (China Mathematical Olympiad 2018, Problem 1). they are usually disguised so as to make the solutions difficult. IOQM2021-22 Part A -Answer Key. In addition, the linked file also contains a hyperlink to each of the corresponding solution threads on Art of Problem-Solving. As this International Math Olympiad Problems And Solutions Pdf Pdf, it ends stirring inborn one of the favored ebook International Math Olympiad Problems And Solutions Pdf Pdf collections that we have. Includes over 120 problems with hints and full, sometimes multiple, solutions. We are especially pleased with the efforts of these students. It is suitable for high school pupils (Grade 7 to. Section B. 101 Problems in Algebra - MATHEMATICAL OLYMPIADS. 2 1999 Regional Contests: Problems and Solutions 209 1 Asian Pacific Mathematical Olympiad 209 2 Austrian-Polish Mathematics Competition 214 3 Balkan Mathematical Olympiad 221 4 Czech and Slovak Match 225 5 Hungary-Israel Binational Mathematical Competition. You will need a reasonably recent distribution of TeX to process these files. Solution 1: The answer is P(x) being any constant polynomial and P(x) ≡ kx2 +kx+c for any (nonzero) constant k and constant c. Game Theory, Alive - Anna R. International Mathematical Olympiad (1961) Problems and Solutions Day 2 Mark Lemuel C. Sample PDF of IMO for. We are especially pleased with the efforts of these students. IMO General Regulations 6. Buy Problems and Solutions in Mathematical Olympiad: High School 1 (Mathematical Olympiad Series) (Mathematical Olympiad Series, 18) on Amazon. While a few problems can be solved using algebra, nearly all problems can be solved by other, more elementary, methods. Functional Equations. Hence there exist t, 1 t rsuch that p t t. It started as the Inter-School Mathematical Competition in the mid-1950. Therefore, you can devise your solutions by thinking for yourself. Gilbert, and Loren C. Polya Mathematical Discovery by G. The 400 Math Olympiad contest problems contained in this book are organised into 16 sets of five contests each. ,k2 +2k +1}. MOEMS ® is a 501 (C) (3) which was established in 1979. Problems and Solutions Vol. SASMO is open to all Primary 2 to 6 and Secondary 1 to 4 students (Grade 2 to 10 students from International schools). But, once you can maintain others to begin reading, it will be better. 1970 Canadian MO. 1 Introduction This is a personal compilation of solutions to International Mathematical Olympiad problems. even number, so the functions identi ed in the beginning of the solution are actually the only solutions to the equation. a) Prove that An is finite if and only if n 6= 2. Question 11. Mathematical Olympiad Challenges. Its capability to stir emotions, provoke thought, and instigate transformation is really. Pablo Soberón. Krusemeyer, George T. Math Olympiad Problems And Solutions Math Olympiad Problems And Solutions Book Review: Unveiling the Magic of Language In an electronic era where connections and knowledge reign supreme, the enchanting power of language has are more apparent than ever. This is why you remain in the best website to see the incredible books to have. Math Olympiad Questions And Solutions. We would like to show you a description here but the site won’t allow us. Concepts and Properties of Trigonometric. Construct isosceles triangles P AB and QBC on one side of the segment AC such that ∠AP B = ∠BQC = 120 and an isosceles triangle RAC on the otherside of AC such that ∠ARC = 120. Mathematical Olympiad Challenges. Prove that 3 ¨ (a 2+ 1)(b c + 1) 6 ‡ a+ b+ c 3 „ 2 + 1: A2. ) Nick's Mathematical Puzzles-- Challenging problems with hints and solutions. Problems And Solutions Bing Pdf can be taken as with ease as picked to act. Luxemburg, L. “ =pEF,EPq ` =pFP,FEq “ =pFP,EPq “ =pDF, DEq “ =pBI,ICq,. Periodic Sequences Page: 315 26. Find the minimum possible value of a 1 1 + a 2 1 + a 1 + a 3 1 + a 1 + a 2 + + a n 1 + a 1 + a 2 + + a n 1: Solution. Periodical available in print and online. (This problem was proposed by Kiran Kedlaya. Prove that there exist in nitely many integers msuch that. Mathematical Olympiad in China : Problems and Solutions. Junior (years 7-8) practice questions and solutions to prepare for the 2019 AMC. Sample Chapter(s) Introduction (1,695 KB). Dmitry Fomin, Alexey Kirichenko, "Leningrad Mathematical Olympiads 1987-1991", MathPro Press, 1994. This is just one of the solutions for you to be successful. Lemma 1. All the students from class 1 to 12 are suggested to participate in this examination to improve their skills in Maths. Bulgarian Czech English Finnish French German Greek Hebrew Hungarian Polish Portuguese Romanian Serbian Slovak Swedish Vietnamese. This is just one of the solutions for you to be successful. 01 MB · . Write M+ j= p 1 1 p 2 2 p r r; r<n: But M+j>nn 1. PRMO 2019 Question Paper. For a given positive integer k find, in terms of k, the minimum value of N for which there is a set of 2k + 1 distinct positive integers that has sum greater than N but every subset of size k has sum at most N/2. We achieved a new state-of-the-art (41. Mathematical Olympiad problems with solutions for the years 2002–2006 appear in an earlier volume, Mathematical Olympiad in China. Determine all polynomials P (x) with real coefficients such that (x+1)P (x−1)− (x−1)P (x)is a constant polynomial. Download Problems And Solutions In Mathematical Olympiad High School 2 Book in PDF, Epub and Kindle. Section B. Third International Olympiad, 1961 1961/1. pdf 1 31/1/2019 12:10:09 PM SAMPLE WebNCERT Mathematics Textbook for Class XI[NCF – 2005] includes some of most fundamental & important topics of Olympiad mathematics like “Set Theory”, “Principle of. Section A: Questions 1 to 10 score 2 points each, no points are deducted for unanswered question and 1 point is deducted for wrong answer. <Problem #3>. ¾Modern Problems of Mathematical Physics¿. Answer 1 48 2 43 3 3774 4 669 5 983 6 21 7 231 8 40 9 4656 10 202 11 180. Finally, though this note is aimed for students participating in the Bangladesh Mathematical. The series is edited by the head coaches of. There are some source files available if you want to re-create the exam files on your own, modify them, or re-use parts of them. The following explains, defines, or lists some of the words that may be used in Olympiad problems. Solutions IOQM2021-22 Part A -Question Paper. Let S= f1;4;8;9;16;:::gbe the set of perfect powers of integers, i. APMO 1989-2009 (Problems & Solutions) - Dong Suugaku - download here. Putnam and Beyond - Răzvan Gelca 2017-09-19. of 3 Mathematics Olympiad Problems And Solutions practice problems for the math olympiad - 1 practice problems for the math olympiad p. – Samara : Samara University Press, 2010. Hence there exist t, 1 t rsuch that p t t. So you'd be better prepared for math tests and life in general. Write M+ j= p 1 1 p 2 2 p r r; r<n: But M+j>nn 1. Consequently, if we can. 1142/12087 | May 2022 Pages: 580 By (author): Bin Xiong (East China Normal University, China) and Zhi-Gang Feng (Shanghai High School, China) Translated by: Tian-You Zhou (Shanghai High School, China) View Full Book Tools Share Recommend to Library. Page 4. (Ireland) A2. . mmsegmentation model zoo, helena montana jobs, ranch bred quarter horses for sale, apartments in poinciana fl, women humping a man, limitless 123movies, best push mower 2023, mua malkova, nude blackcat, what can i do if my neighbor is recording me, ass tubexxx, blondeadobo thothub co8rr