PUMaC 2007 · 组合（A 组） · 第 5 题

PUMaC 2007 — Combinatorics (Division A) — Problem 5

Bob, having little else to do, rolls a fair 6-sided die until the sum of his rolls is greater than or equal to 700. What is the expected number of rolls needed? Any answer within .0001 of the correct answer will be accepted.

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