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标题: GWD23-16 [打印本页]

作者: norgar 时间: 2009-8-19 06:47 标题: GWD23-16

Q16:

If k is a positive integer, what is the remainder when 2^k is divided by 10 ?

(1) k is divisible by 10.

(2) k is divisible by 4.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer:

为什么是B呢

作者: berylgirls 时间: 2009-8-19 22:07

2^4=16,

16的任意次方，结果的个位都是6，被10除，余数都是6

作者: chwayne 时间: 2009-8-21 20:14

余数是6吧

作者: chriszhx 时间: 2009-8-24 06:37

why the first condition is not sufficient??

作者: carollai 时间: 2009-8-25 06:42

2^10个位数为4，2^20个位数为6，后面一直是4和6重复，余数有两种情况：4和6，所以不充分

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