一道sat2数学题,the only prime factors of a number 'n' are 2,5,7,and 17.which of the following could not be a factor of a）10 b) 20 c) 25 d)30 e)34

分类: 作业答案 • 2021-12-19 15:01:18

问题描述：

一道sat2数学题,
the only prime factors of a number 'n' are 2,5,7,and 17.which of the following could not be a factor of
a）10 b) 20 c) 25 d)30 e)34

答

d
10 = 2*5
20 = 2*2*5
25 = 5*5
34 = 2*17
30 = 2*3*5, and 3 is not on the list of prime factors.

答

亲,选择C吧,题目意思是说,只能n的因子只能是2,5,7,17,而10=2*5,20=2*2*5,30=2*3*5【3不符合要求】,34=2*17,所以选择C.