国际顶尖MBA申请交流平台--TOPWAY MBA

标题: jj-18 [打印本页]

作者: qiufeng1990 时间: 2002-10-5 00:02 标题: jj-18

9、7 positive integers, 5 are odd, 2 are even. First pick up 4 out of them and get the sum of them, then pick up 2 from the rest and also get the sum. Which of the following must be true?
(1)at least one of the sums is odd; (4odd,　２even)
(2)at least one of the sums is even; (3odd1even, 1odd1even)
(3) the sum of the two sums is even. (4odd, 1odd1even)
【机委】NONE。
我选了I，可能是把机经记错啦。
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II。感谢cook的指点！！
滚据解释，是【机委】NONE。????? why II?

作者: tongxun 时间: 2002-10-5 00:24

对！我与cook把两个和都加起来了。烦请以后有机警讨论多提点！

作者: pgclt 时间: 2002-10-5 00:25

I remember the original problem is products, not sums. that may explain why 2).

作者: tongxun 时间: 2002-10-5 00:27

确实有过这么一题，谢谢pgclt！

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