标题: a question from Prep...! thanks [打印本页] 作者: seuhongkai 时间: 2010-11-20 07:10 标题: a question from Prep...! thanks
106. If x and y are integers, is xy even?
(1) x = y + 1
(2)
x/y
is an even integer.
answer is D from Prep
why (1) is right. if Y=0, X=1, then xy is 0, which is not even. why we dont consider 0 here??? thanks作者: rudder86 时间: 2010-11-20 21:22
0是偶数作者: IMARCUS 时间: 2010-11-21 06:41
LZ should think this way: If X = Y + 1, then X and Y are consecutive intigers. Among a pair of consecutive intigers, one of them must be an even number.作者: seuhongkai 时间: 2010-11-21 18:45
所以0是偶数。。。？？SORRY。。那也的0和1一对 0是偶数吧。。。
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