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A composite number is a positive integer greater than 1 that has more than two distinct positive divisors. In this case, the number 51 is a composite number because it has divisors other than 1 and itself, such as 3 and 17. Numbers 31, 41, and 61 are all prime numbers, as they only have two distinct positive divisors, 1 and the number itself.

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51 is composite. 51 = 3 x 17.

The other three numbers are prime numbers.

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Wiki User

12y ago
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Karston Yoder

Lvl 1
3y ago
that was very helpful

51

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Karston Yoder

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3y ago
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Q: Which of the numbers 31 41 51 and 61 is a composite number?
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