Problem 1332
You are playing a card game that consists of using ten different numbered cards laying face down on a table. The faces of the cards are labeled using the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 (each card is numbered differently). You turn over two different cards and leave them face up on the table. What is the probability that the sum of the two cards is even?
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