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)