Solve Tennis Score Puzzle: Use Modular Arithmetic

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In tennis, the players switch sides after the odd games. one hot sunday the auther found himself on the side where he had begun the match a while earlier. He knew the game score was either 6-2, 4-3 or 6-2, 5-4. which was it? you must use modular arithmetic to solve this
 
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Hmm, what does "odd games" refer to?
 

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