Please help.
If two of the four expressions x+y, x+5y, x-y, 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?
1/2
1/3
1/4
1/5
1/6
OA: E
If two of the four expressions x+y, x+5y, x-y, 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?
1/2
1/3
1/4
1/5
1/6
OA: E
