A deck of forty cards consists of four 1's, four 2's,..., and four 10's. A matching pair (two cards with the same number) is removed from the deck. Given that these cards are not returned to the deck, let $$m/n$$ be the probability that two randomly selected cards also form a pair, where $$m$$ and $$n$$ are relatively prime positive integers. Find $$m + n.$$

(第十八届AIME2 2000 第3题)