题库搜索>问题求解PS-13628
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 ?
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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
813508gqi
题目错了，4、4的概率不是1/36
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2022-07-20 13:56:14
旮旮
if：条件概率
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2021-11-11 09:32:03
200033bt
请问为什么这个题4 4的情况不用考虑两遍
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2021-11-10 12:08:07
球七百佳回复200033bt
同问
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2022-01-08 09:40:32
Peipei冲呀回复200033bt
因为44 是一样的啊，肉眼分不出先后
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2022-04-13 10:56:50
秦喆
为啥我把这题想复杂了
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2017-07-29 13:30:21
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