PUMaC 2007 · 组合（B 组） · 第 2 题

PUMaC 2007 — Combinatorics (Division B) — Problem 2

In how many distinguishable ways can 10 distinct pool balls be formed into a pyramid (6 on the bottom, 3 in the middle, one on top), assuming that all rotations of the pyramid are indistinguish- able?

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