问一道OG11中的题，知道很弱，就是想不通

cby1982

先谢谢了！

综合P286，第71题

A number of people each wrote down one of the first 30 positive intergers.Were any of the intergers written down by more than one of the people?

(1)The number of people who wrote down an interger was greater than 40

(2)The number of people who wrote down an interger was less  than 70

The answer is (A)

wongbin

一堆人写30个数中任意一个，有没有一个数被超过一个人写

大于40个人写

小于70个人写

解答，只要满足人数超过30就会有重复，何况大于40人呢？

小于70的话，如果小于等于30人就有可能不成立

cby1982

哎呀呀，我想成了每个数都被至少写一遍……

晕了晕了，不好意思，谢谢啊呵呵