标题:
求助PREP上的DS题
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作者:
wangliming
时间:
2010-4-25 19:05
标题:
求助PREP上的DS题
A certain list of several different integers. Is the product of all the integers in the list positive?
1 the product of the greatest and the smallest of the integers in the list is positive
2 there is an even number of integers in the list
请问大家选什么。。。答案是c 我选的E 我的思路是:如果这组数就-4 -2 -1 三个数的话,满足12两个条件,但是就不行,若果1 2 4 的话, 就可以,所以我选E,不知道我的思路对不对。。。
What is the remainder when the positive integer n is divided by the positive integer k (k>1)
1 n=(k+1)^3
2 k=5
答案是A。。。求做法。。。
作者:
franker
时间:
2010-4-26 06:42
1. even是偶数
2. n=(k+1)^3=k^3+3k^2+3k+1 被k除余1
作者:
xingzixin
时间:
2010-4-29 22:07
条件2是说数字个数为even
不是there is an even number in the list
而是there is an even number of integers in the list 就是注意不要搞混了哈 做math最怕弄丢一两个词,致命啊......
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