Which number is a composite number? A. 11 B. 21 C. 31 D. 41
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A whole number that can be made by multiplying other whole numbers. Example: 6 can be made by 2 × 3 so is a composite number. But 7 can not be made by multiplying other whole numbers (1×7 would work, but we said to use other whole numbers) so is not a composite number, it is a prime number.
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