扫描二维码，直接登录
题库 / Prep2007E1-DS-136
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.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
大于20 的两位数
条件一：十位是个位的一个因子，那么十位和个位共有至少一个因子，就是十位上的这个数字，所以肯定能被tens digit整除，又因为十位数大于二，所以肯定为合数
条件二：23