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You find all the factors of 51. The factors are 1, 51, 3, 17. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0. 51 is COMPOSITE.

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Q: How do you solve if 51 is prime or composite?

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51 is a composite number because 3 X 17 = 51 and 1 X 51 = 51.

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