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标题: GWD1-31 [打印本页]

作者: fengyingx 时间: 2010-1-18 07:31 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: rearn 时间: 2010-1-18 18:54

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

作者: jianina 时间: 2010-1-21 06:52

hey where can i download GWD ?

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