Question: In poker, a hand containing face values of the form (x, x, y, z, w) is called one pair.
a) If I deal a poker hand, what is the probability that I get one pair?
b) I keep dealing independent poker hands. Write an expression for the probability that I get my 150th one pair' on or after the 400th deal.
c) Approximately what is the value of the probability in b)?