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 x2 – (by)2, where b is an integer? \small \frac{1}{2} \small \frac{1}{3} \small \frac{1}{4} \small \frac{1}{5} \small \frac{1}{6} next end review review screen 1.00