99,回複：Quant麵試題：喝醉了（2.5星）

來源: randommatrix 於 2009-11-14 10:37:20 [] [舊帖] [給我悄悄話] 閱讀數 : (246 bytes)

First, the probability of entering the left door is almost one as n goes large.(by an induction formula).
Then it can be derived
E(n+1)=E(n)+1.
Since E(1)=0.
Then E(100)=99.














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