TWO PAIR

==========

There are (13 choose 2) denominations for each pair.

There are (4 choose 2)^2 suits for each pair.

There is (4 choose 1) suits for the stray kicker over

(11 choose 1) denominations.

The product is 78 * 6^2 * 4 * 11 = 123552

123552/2598960 = 0.047539+