求助，对此題的答案不是很理解

proteus

if X is prime, is X>4?

(1)X is a factor of 10.

(2)X is a factor of 16.

答案是statement(2) alone is sufficient.不能理解题目。

[此贴子已经被作者于2008-10-27 23:55:53编辑过]

qqchen

(1) factors of 10 : 2,5,10

X is prime =2 ( > 4) or 5( <4 )

not sufficiet

(2) factors of 16: 2,4,8,16

X is prime = 2 <4   

sufficient

B