12345随机取3四个数任意取三个数字字,问任意一四个数任意取三个数字字被取出来的概率为多少?


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展开全部偶数要求个位必须是2或4,如果百位也是2或4,C(2,1)×C(3,1)=6,如果百位不是2或4,C(2,1)×C(3,1)×C(3,1)=18,6+18=24,一共24种偶数。24÷A(5,3)=2/5,所以是偶数的概率是2/5已赞过已踩过你对这个回答的评价是?评论
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首先,我们可以列出所有取三个数的情况,共有10种:1,2,3 1,2,4 1,2,5 1,3,4 1,3,5 1,4,5 2,3,4 2,3,5 2,4,5 3,4,5其中,有6种情况的积为偶数,分别是:1,2,4 1,2,5 1,4,5 2,3,4 2,3,5 2,4,5我们再来看这6种情况中,哪些满足它们之和大于8。我们可以将它们按照和的大小排列:1,4,5 -> 10 2,3,5 -> 10 1,2,5 -> 8 1,2,4 -> 7 2,4,5 -> 11 2,3,4 -> 9可以看出,有4种情况满足它们之和大于8,分别是:1,4,5 2,3,5 2,4,5 2,3,4因此,满足条件的情况数为4,总的情况数为10,所以概率为4/10=2/5。

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展开全部∵全部结果一共5*5*5种,就是125种等于9的有513(6种),522(3种),441(3种),432(6种),333(1种)∴详细点就是111.112.113.114.115.121.122.123.124.125.131.132.133.134.135.141.142.143.144.145.151.152.153.154.155为一组。共5列5行。所以25种。如此类推。还会有多5种这样的,即2*5*5.然后算出相加为9的数字有。 513(6种),522(3种),441(3种),432(6种),333(1种)因为可以重复所以有多种。结果就是(6+3+3+6+1)/125打的挺辛苦的,希望采纳。已赞过已踩过你对这个回答的评价是?评论
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