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Probability Question - GMATPREP

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Probability Question - GMATPREP [#permalink] New post 02 Jun 2006, 09:56
Please see attachment. Please Explain the steps of how you got to the answer
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 [#permalink] New post 02 Jun 2006, 11:16
of the expressions on (x-y)*(x+y) results in a product of the form x^2-(by)^2.

Num of possible expressions are 4C2 = 6
Hence Prob = 1/6
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 [#permalink] New post 02 Jun 2006, 11:18
Thanks a lot. I just got the answer a second or 2 before you provided the solution. But Thanks anyways!!
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 [#permalink] New post 02 Jun 2006, 18:10
Its 1/4c2=1/6. Only one combination of products [(x+y)(x-y)] will yeild a result in the form of x^2-(by)^2.
  [#permalink] 02 Jun 2006, 18:10
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