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[Problem Solving]

试题详情

题目:

Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn.  If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5 ?

选项:

A、1/6
B、1/5
C、1/3
D、2/5
E、2/3

答案:

D

提问:

这种概率题还是不太会

解答:

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阅读3687
解答: sysadmin

提问:

这种概率题还是不太会

解答:

点赞0
阅读3688
解答: sysadmin老师

提问:

排列组合的问题

解答:

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阅读3585
解答: sysadmin老师

提问:

我的思路是: 分母: 共6 种选法, 分子: 共2 种: 3,5 或5,3 所以选了1/3

解答:

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阅读3662
解答: sysadmin老师

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