A quiz was administered to four students.Somehow the quizzes got shuffled,
and the one at the top of the stack was returned to first student
,the one below it was returned to the second student,and so on.
Find the probability that at least one student got his own quiz back.
請問各位大大,如何去思考這類的題目呢?
是利用配對方式去想比較容易嗎?我想知道各位的想法?謝謝!
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