Making Combinatorics Manageable: Alejandra is designing a game of chance скачать в хорошем качестве

Making Combinatorics Manageable: Alejandra is designing a game of chance

Combinatorics aren't as tough as they look once you know a few core processes. No need to memorize formulas! In this video, I show how to solve a tough question using a process-based approach. For a complete system for solving Quant and Data Insights questions (including more combinatorics examples on pages 537-557), get The GMAT Mentor on Amazon: https://www.amazon.com/GMAT-Mentor-Qu... Check out my website for sample chapters, study plans, and more: https://www.thegmatmentor.com/ -- Alejandra is designing a game of chance. For one part of the game, a player is to randomly choose 3 marbles, without replacement, from a box containing B blue marbles, R red marbles, and no other marbles. Alejandra correctly determined the positive integers B and R so that the number of possible selections in which 1 blue marble and 2 red marbles are chosen is twice the number of possible selections in which 2 blue marbles and 1 red marble are chosen. The positive integers B and R that Alejandra determined must be such that B is the number that is __ 1 __ and R is the number that is __ 2 __. Based on the information provided, select for 1 and for 2 the options that create the most accurate statement. Make only two selections, one in each column. (A) R +2 (B) 2B - 1 (C) B - 2 (D) (B + 1)/2 (E) (R + 1)/2 (F) (R + 2)/2