Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and答案解析-雷哥GMAT

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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 ?

A

1/6
分析A选项
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B

1/5
分析B选项
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C

1/3
分析C选项
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D

2/5
分析D选项
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E

2/3
分析E选项
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当前版本由 kisenana 更新于2015-12-23 16:57:14 感谢由 kisenana 对此题目的解答所做出的贡献。

如果两个数的和是8 那可能性只有 44 26 62 53 35 这五种情况，那么有5的情况就是2/5

题目讨论（3条评论）

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目标750

主要是“First one card is drawn and then put back into the bowl; then a second card is drawn.”这句话没看懂， 这句话说的是抽牌的方式。“先抽一张放碗里，然后再抽一张（不是同时抽2张）”，所以分别先后抽到3,5和5,3是不一样的，是分别计算的。

0 回复 2021-06-18 12:30:21

lowkeyf

如果两个数的和是8 那可能性只有 44 26 62 53 35 这五种情况，那么有5的情况就是2/5

0 回复 2018-10-08 11:09:42

kamini

为什么44只算成一次

1 0 回复 2018-04-30 15:22:03
dreamturelater回复kamini

4,4 and 4,4 doesn't get counted as distinct outcomes because they are exactly the same (we're not picking two cards each numbered 4, but the same card). In each case, the same card is selected, put bag, and selected again.

0 0 回复 2018-10-15 17:09:08