PUMaC 2007 · 组合（B 组） · 第 1 题
PUMaC 2007 — Combinatorics (Division B) — Problem 1
题目详情
- Bob and Bill’s history class has 32 people in it, but only 30 people are allowed per class. Two people will be randomly selected for transfer to a random one of two history classes. What is the probability that Bob and Bill are both transferred, and that they are placed in the same class? Write your answer as a fraction in lowest terms.
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Original Explanation
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