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'3'

3 x 4 = 12

3 x 7 = 21

NB '7' is also a Prime number.

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lenpollock

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1y ago

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More answers

3 times 7 equal to 21 and 3 times 4 equal to 12 the prime factor is 7

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3

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Wiki User

15y ago
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Q: What number is a prime factor of both 12 and 21?
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