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【OG20-P149-24题】
In a set of 24 cards, each card is numbered with a different positive integer from 1 to 24. One card will be drawn at random from the set. What is the probability that the card drawn will have either a number that is divisible by both 2 and 3 or a number that is divisible by 7 ?
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能够被2和3整除的数即是6的倍数:有4个
能够被7整除的数:有3个
1-24里不含6和7的公倍数
P=(4+3)/24=7/24
题目讨论 (6条评论)

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166453my
不用把1算进去吗?
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0 回复 2022-08-29 08:54:59
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720515nydni
眼神不好,数错了 :)
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0 回复 2021-12-09 22:45:38
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331637w
对这里的or 理解错误。。
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0 回复 2020-11-06 21:29:42
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432442ba
把28算进去了.....眼神不好了
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0 回复 2019-10-05 17:54:18
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黄渣渣
emm 求解释
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0 回复 2018-07-31 06:34:54
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Angelma回复黄渣渣
被2和3同时整除的有6,12,18,24;被7整除的有7,14,21。所以一共有七个数,probability是7/24
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0 回复 2018-08-30 07:13:58
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identici
emm 求解释
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0 回复 2018-07-29 09:04:06