gwd 2-13

kuuiytt

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.

Ans:A

what this question means for??? I have no idea??

please help to solve this question

kuuiytt

thanks  a  lot!1

himba

此题的意思是说：一个整数大于1且不是质数称为合数。 如果一个两位数n 大于20， 是合数吗？

1. n的十位数是个位数的因子

2.十位数为2

明白意思就应该会做了。