求解一道prep数学题大家帮帮忙

brenda47 · 发表于 2011-3-12 21:24:33

The integer M and P such that 2<M<

and M is not a factor of P. If R is the remainder when P is divided by M, is R>1?
(1) the greatest common factor of M and P is 2
(2) the least common multiple of M and p is 30
答案选A 我想问为什么B不对呢请指教

Raymond_GMAT · 发表于 2011-3-12 21:44:15

关于B，lz 看看 6和5， 10和3.

brenda47 · 发表于 2011-3-12 22:14:44

嗯，我就是这点不懂，两组取值得到的R都是1，这样能不能就说明R不大于1,从而回答了题干中的问题了呢

yiw006 · 发表于 2011-3-12 22:19:43

如果倒過來呢？

5/6

3/10 ?

題目未標明哪個數較大

brenda47 · 发表于 2011-3-12 22:39:37

啊~~sorry sorry
题干中我少加了一个条件2<M<

brenda47 · 发表于 2011-3-13 13:51:26

自己顶

RabbitG · 发表于 2011-3-13 17:05:49

In statement 1, both m and p are even. therefore, the remainder is even, so it's greater than 1.

In sataement 2, pick 5 and 6 ( the reminder is 1), 10 and 15 ( the reminder is 5 ), so it is insufficent.

求解一道prep数学题大家帮帮忙

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求解一道prep数学题 大家帮帮忙

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求解一道prep数学题大家帮帮忙