GMAT2 Q13

[ai12345]

Q13
An integer greater than 1 that is not prime is called composite. if the two-digit integer n is greater than 20 , is n composite?
(1) The tens digit of n is a factor of the units digit of n
(2) The tens digit of n is 2
答案: A
不了解(1) 可算出19 17 24 26 36 48....應該是不充分阿
有沒有人可救救我

[hsyeng]

if the two-digit integer n is greater than 20