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There are 30 days in September. 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29 are prime. 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28 and 30 are composite. 1 is neither. The prime numbers have two factors. The composite numbers have more than two.

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Q: What days in September have a prime number date How many have a composite number date Show how you know?
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