PUMaC 2007 · 组合（A 组） · 第 2 题
PUMaC 2007 — Combinatorics (Division A) — Problem 2
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
暂无解答链接。
Original Explanation
No solutions link available.