5个人并排排成一排，其中甲不能够排在两头，问一共有多少种排法?

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问题 5个人并排排成一排，其中甲不能够排在两头，问一共有多少种排法?

选项 A、48
B、63
C、64
D、72
E、81

答案D

解析有限制的元素是甲不能够排在两头，那么甲只能在中间三个位置上选择一个。共有P₃¹种，剩下4个人4个位置没有限制，是一个全排列，为P₄⁴，这样一共有P₃¹×P₄⁴=72种排法。

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5个人并排排成一排，其中甲不能够排在两头，问一共有多少种排法?

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Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportant

Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff

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5个人并排排成一排，其中甲不能够排在两头，问一共有多少种排法?

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Youwillbelate______youleaveimmediately.

Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportant

Manyayoungpersontellsmehewantstobeawriter.Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdiff

Babieswhoarebreast-fedmaybemorelikelytobesuccessfulinlife,anewstudypublishedTuesdaysuggests.Thestudyfollowe

Allthefollowingcasesareon-the-jobsmokingexceptthat______.Passivesmokingmeans______.

圆心在原点、半径为5的圆上有多少个整数点?

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自保险人向投保人签发保险单或者其他保险凭证时起，保险合同成立。( )

2012年安徽商业银行面试真题齐白石的话“学我者生，似我者死”，你怎么看?

Manywilldoubttobaccoindustryclaimsthatitissharpeningitssciencetoevaluate"healthiercigarettes".Butthat’swhatwi

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Allthefollowingcasesareon-the-jobsmokingexceptthat.Passivesmokingmeans.

自保险人向投保人签发保险单或者其他保险凭证时起，保险合同成立。(　　)