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
6个骰子的概率？
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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)
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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