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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: 10030