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# Probability Question - GMATPREP

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Senior Manager
Joined: 01 Feb 2005
Posts: 274
Followers: 1

Kudos [?]: 38 [0], given: 1

Probability Question - GMATPREP [#permalink]  02 Jun 2006, 08:56
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VP
Joined: 21 Sep 2003
Posts: 1069
Location: USA
Followers: 3

Kudos [?]: 38 [0], given: 0

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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Senior Manager
Joined: 01 Feb 2005
Posts: 274
Followers: 1

Kudos [?]: 38 [0], given: 1

Thanks a lot. I just got the answer a second or 2 before you provided the solution. But Thanks anyways!!
Intern
Joined: 29 Apr 2006
Posts: 14
Followers: 0

Kudos [?]: 0 [0], given: 0

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.
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# Probability Question - GMATPREP

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