PUMaC 2025 · 组合（A 组） · 第 4 题

PUMaC 2025 — Combinatorics (Division A) — Problem 4

Zongshu is selling socks in packs of 2025. Each sock in each pack is equally likely to be red, green, or yellow. You buy (a positive number of) packs of socks until you can split all of the socks into pairs of the same color. Find the expected number of packs you buy.

解析

暂无解答链接。

No solutions link available.