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by muzali » Tue Dec 02, 2008 5:02 pm
x^2-(by)^2 = (x+by)(x-by)

The 4 given terms can combine in (4*3)/2 ways to give 6 terms which are products of the respective terms.

There is only one set of prodcuts which is of the form required: (x+y)(x-y)

So, probability = 1/6
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