高一條件機率 - 包包
By Bethany
at 2015-05-30T00:00
at 2015-05-30T00:00
Table of Contents
1.設有一門關閉的機率為,某人回家之前從包包內的十把鑰匙中任取三把(每把被取到的機會均等),並已知此包包內只有一把鑰匙能開得了門。假設此人進門,求此人是取到開門鑰匙而進門的機率__________﹒
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包包
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