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Anonymous
The number 7 and 21 have a common factor of 7. This means that 7 is a divisor of both 7 and 21. In mathematical terms, 7 is a factor of both numbers, as it divides each of them without leaving a remainder.
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1 and 7
Wiki User
1, 3, 7, and 21
7 and 3
1 and 7.
7
The common factors are 1 and 7.