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6个骰子的概率?

(2007-10-30 22:59:08) 下一个
投6个骰子后,出现四个不同数字的概率?需解题过程。
四个不同数字如:112236,233356
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volplayer 回复 悄悄话 The question is how many such numbers out of total 6^6 numbers.

There are two types, 1113 (e.g. 233356) and 1122 (e.g. 112236)

# of 1113 type: (6 choose 4) * 3
# of 1122 type: (6 choose 4) * (4 choose 2)
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