作者pei33ho (酸)
看板GMAT
标题[计量] PP1-DS-136
时间Mon Nov 2 12:30:47 2009
136. 13960-!-item-!-187;#058&009782
An integer greater than 1 that is not prime is called composite.
If the two-digit integer n is greater than 20, is n composite?
(1) The tens digit of n is a factor of the units digit of n.
(2) The tens digit of n is 2.
答案A
想问(1)不能包含17.19这类数字吗?总觉得17.19这种算是反例呀?
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1F：推 Ertai:题目不是说 n>20了 考虑17 19干嘛0.0? 11/02 12:52
2F：→ pei33ho:阿～算到中邪～谢谢喔!!! 11/02 12:58