GRE Exam Numerical Ability Algebra

If ab=x, and a/b=y and ab does not equal zero, then a² − b² = ? (A) x(y-1)(y+1)/y (B) xy - (x/y) (C) x² - y² (D) (y+x)(y-x)/x

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ab = x ; a/b = y-->a^2 =xy & b^2 = x/y
Therefore, a^2 - b^2 = xy - (x/y)-->Option B
6 years agoHelpfull: Yes(0) No(0)

GRE Other Question

What is the probability that a two digit number chosen at random will be a multiple of 3 and not of 5? (A) 1/3 (B) 2/15 (C) 4/15 (D) 2/9 (E) 8/15 If a² – ab = 2b², which of the following could be b/a ?
I. 1/2
II. 2
III. -1

(A) I only (B) II only (C) I and II (D) I and III (E) II and III