ou have been dealt a couple of cards from a well shuffled 52 card deck. What
is the probability that you have a pair?
will identify a pair so that
corresponds to a pair of two's,
corresponds to a pair of 3's, and so fourth... aces correspond to
the n-union below is a total event:
the n-union also consists of disjoint events:
we now apply the formula (
The value of every term above is independent of
there are 51 cards remaining and 3 of them are "two".