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标题: TT gwd-5-13, [打印本页]

作者: 小腾 时间: 2006-7-27 14:50 标题: TT gwd-5-13,

what is the remainder when the positive integer n is divided by 3?

1) the remainder when n is divided by 2 is 1.

2) the remainder when n+1 is divided by 3 is 2.

I choose C,but of coz, i was wrong....

it's already not the first time i made mistake in such question, do you xdjm have good method to solve this question..

作者: missouyang 时间: 2006-7-27 15:44

from the second term, we get that
3p+2=n+1
n=3p+1
(3p+1)/3 the remainder is 1

作者: 我是魔鬼 时间: 2006-7-27 22:00

B是正确的阿

n+1/3the remainder is 2

so n/3 the remainder is 1

chose B

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