昨天PREP模考完，碰到的几个数学难题，请各位帮忙看看！

elw2012 · 发表于 2012-8-21 11:24:22

1. If the integers a and n are greater than 1 and the product of the first 8 positive integers is a multiple of a^n, what is the value of a?

1) a^n=64;

2) n=6.

2. h(n)=2*4*6*8...*n, what is the least prime factor of h(100)+1?

A. less than 10

B. Between 10 and 20

C. Between 20 and 30

D. Between 30 and 40

E. Greater than 40

3. What is the greatest prime factor of 4^17-2^28?

A. 2; B. 3; C. 5; D. 7; E. 11

elw2012 · 发表于 2012-8-21 12:09:10

全对！！兄弟你太给力了

elw2012 · 发表于 2012-8-21 12:21:07

答对了！崇拜~

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