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标题: OG 11th 207/208题 [打印本页]

作者: lewis 时间: 2006-10-2 09:08 标题: OG 11th 207/208题

207. If n=4p, where p is a prime number greater than 2, how many differnt positive even divisors does n have, including n

Answer: 4

但是我就看到两个啊，2p和4p

208.S is a set contraining 9 different numbers. T is a set containing 8 different numbers, all of which are members of S.Which of the following statements CANNOT be true?

Answer: The range of S is less than the range of T.

什么叫做the range?

另外有个statment：The range of S is equal to the range of T. 有可能么？

多谢赐教

作者: assurance 时间: 2006-10-2 20:46

n=4p

since p is prime number greater than 2, n 一定能被2，4除掉

加上你的2p, 4p, 所以有四个

这里的range应该是指最高数与最低数的距离。因为set T的全部numbers都是在set S, set S还有多一个号码，所以 set T的range最多能跟set S一样

作者: lewis 时间: 2006-10-4 08:11

thanks !!!

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