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If you pick numbers and x=0.5 and y=2 then the answer is 8 (C). If you pick x=1 and y=1 then the answer is 16 (D). Unless it is stated that x and y are integers it's not a "given." Guessing in this situation is risky. I would work the problem.
- by barnesthad
Wed Jul 22, 2009 4:55 am- Forum: Problem Solving
- Topic: GMAT Prep Question Exponents
- Replies: 10
- Views: 5928