PUMaC 2007 · 组合（B 组） · 第 7 题
PUMaC 2007 — Combinatorics (Division B) — Problem 7
题目详情
- Tom is searching for the 6 books he needs in a random pile of 30 books. What is the expected number of books must he examine before finding all 6 books he needs?
解析
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Original Explanation
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