求教prep中的一道数学，多谢多谢

COOKINGMAT

DS:
If q is a potitive integer less than 17 and r is the remainder, when 17 is divided by q,what's the value of r?

(1) q>10
(2) q=2^k where k is a potitive integer

answer: B

我答的事C，请问这题怎么做呀！

Winterfish

用带入法，条件1显然没结论，条件2，只有2，4，8，16符合，被17除都是余1。所以选B

sea_fairy

以下是引用COOKINGMAT在2007-11-27 8:02:00的发言：
DS:
If q is a potitive integer less than 17 and r is the remainder, when 17 is divided by q,what's the value of r?

(1) q>10
(2) q=2^k where k is a potitive integer

answer: B

我答的事C，请问这题怎么做呀！

条件2 知道Q=2， 4， 8 ，16           17除以这四个数的余数都是1。

COOKINGMAT

严重感谢楼上两位！！现在明白了！