下面是出国留学网GMAT频道整理的2015年6月GMAT数学机经(五)，欢迎阅读。
21 F(n) is defined as the product of all even numbers from 2 to n, inclusive. What is the
least prime factor of f(100) + 1.
A. From 2 to 10
B. From 10 to 20
C. From 20 to 30
D. From 30 to 40
E. Greater than 40
22 If point (a, b) is on line k, is the distance from the point to origin greater than 5?
(1) a – b > 5
(2) a^2 + b^2 > 5
23 Is m/n > n/m?
(1) m > n
(2) mn > 0
24 How many intersection does y = x^4 – x^2 have with x-‐axis?
A. 0
B. 1
C. 2
D. 3
E. 4
25 Is x > 0?
(1) x^2 – x^3 = 0
(2) |x| = x
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