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标题: GWD1-31 [打印本页]

作者: shlshing    时间: 2010-6-9 07:01     标题: GWD1-31

Q31:

A positive integer n is said to be “prime-saturated” if the product of all the different positive prime factors of n is less than the square root of n.  What is the greatest two-digit prime-saturated integer?

A.      99

B.      98

C.      97

D.     96

E.      95

Answer: Dhow to calculate?3x
作者: tomchengs    时间: 2010-6-9 22:04

96不同的质因子只有2跟3,积为6,96的平方根应该大于9小于10,所以满足条件。
应该没其他办法,只能一个一个数字验证




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