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The only way to get x^2 - (by)^2 is if you multiply (x+by) with (x-by). Looking at the expressions given, the only pair that will satisfy this is (x+y) & (x-y)

No of ways to pick pairs = C(4,2) = 6

No of pairs satisfying condition = 1

Probability = 1/6

by whiteutkarsh

Sat Dec 14, 2019 1:04 am
Forum: GMAT Math
Topic: GMAT Prep Practice Test Quant Questions #3
Replies: 5
Views: 10025