Exercises 1-3_习题详细

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Exercises 1-3 6

题目

Randomly select different numbers from and try to find the probability of the following events:

The three numbers do not contain and ;

The three numbers do not contain or .

解析

Solution: This problem is a classical concept problem. According to the combination formula, we can get

; ,

For the latter result, property 3 of probability can also be used to obtain

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