Mathematics

10 July, 23:33

If two of the four expressions x + y, x + 5y, x - y, and 5x - y are chosen at random, what is the probability that their product will be of the form of x^2 - (by) ^2, where b is an integer?

A) 1/2

B) 1/3

C) 1/4

D) 1/5

E) 1/6

+2

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