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6個骰子的概率?

(2007-10-30 22:59:08) 下一個
投6個骰子後,出現四個不同數字的概率?需解題過程。
四個不同數字如:112236,233356
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volplayer 回複 悄悄話 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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