A survey of 100 persons revealed that 72 of them had eaten a

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A survey of 100 persons revealed that 72 of them had eaten at restaurant P and that 52 of them had eaten at restaurant Q.Which of the following could not be the number of perspons in the surveyed group who has eaten at both P and A 20B 24C 30 D 50 E 52

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优美的小松鼠

欣喜的毛衣

2026-03-30 17:20:38

选择A。有28个人没有在P吃过饭,假使这28个人都在Q吃过饭(即都在52人之内),那么另外的24人肯定都既在P 又在Q 吃过饭,这是最少的人数。因为如果52个人之中没在P中吃过饭的人少于28个,即多于24个,也就是有多于24个的人在P和Q都吃过饭。

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  • 单薄的宝马
    回复
    2026-03-30 17:20:38

    选择A。有28个人没有在P吃过饭,假使这28个人都在Q吃过饭(即都在52人之内),那么另外的24人肯定都既在P 又在Q 吃过饭,这是最少的人数。因为如果52个人之中没在P中吃过饭的人少于28个,即多于24个,也就是有多于24个的人在P和Q都吃过饭。

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