PUMaC 2007 · 组合（B 组） · 第 4 题
PUMaC 2007 — Combinatorics (Division B) — Problem 4
题目详情
- A cube is formed from n ( n ≥ 2) unit cubes, each painted white on five randomly selected sides. This cube is dipped into paint remover and broken into the original unit cubes. What is the expected number of these unit cubes with exactly four sides painted white?
解析
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Original Explanation
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