[問題] 一題機率
A.B.C.D.E四人各取一張自己的名片,然後將此五張名片放入一袋內,每人由其中取一張
,則各人均沒取得自己名片的機率??
解法:
5!-5*4!+10*3!-10*2!+5*1!-0
P= ____________________________
5!
有高手可以解析一下這個解法嗎?看不太懂...
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