11th OG 71题

albertjerrys

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

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

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

Key is A.

有点看不懂这道题的意思。好像是说一群人每个人写下一个30以前的正整数。有没有数字被谢过超过一次。

（1）这群人写下的整数有一个大于40，但是不是说first 30吗？怎么会又有40？

albertjerrys

楼上的，先谢过了。

请问如果至少需要60人才有可能把1-30个数字都写两次，但是（1）只说了这群人数是大于40的，但是没有说一定是大于60呀？