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clean1983

1, If n is a positive integer and n平方 is divisible by 72,then the largest positive integer that must divide n is

A 6  B 12 C 24 D 36 E 48


2 , 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 persons in the surveyed group who had eaten at both P and Q

a 20 b 24 c 30 d 50 e 52


谁能告诉我上面两道题的正确翻译和解题思路。谢谢