GRE Exam Numerical Ability Number System

If the product of three numbers in GP is 27 and the sum of their product in pairs is 39, then which of the following are the numbers? Indicate all correct options.
A. 1
B. 2
C. 4
D. 3
E. 9

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GRE Other Question

Find f(x)-1/f(x), when f(x) = (x+1)/(x-1)? Indicate all correct options. [n^2 = n*n]
A. 2
B. 2/(x^2-1)
C. 4x/(x^2-1)
D. 4x/[(x+1)(x-1)]
E. 2(x^2+2x-1)/(x^2-1) Let f be a real function defined by f(x) = ax^2+b. Which of the following is true if f(1) = 2 and f(2) = 5? Indicate all correct options. [x^2=x*x]
A. a = 2
B. b = -1
C. a = b
D. b = 1
E. a < b