Total number of cards = 52
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Find total number of red card or a 10:
Total number of cards that are red = 26
Total number of cards that are 10 but not red = 2
Total number of cards that are red card or 10 = 26 + 2 = 28
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P(red card or a 10) = 28/52 = 7/13
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Answer: 7/13