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The GCF of 21, 77, and 84 is 7.

First you have to find the lowest common factor, that is able to be divided by all the numbers.

E.g. 7

*21/7=3

*77/7=11

*84/7=12

3 and 11 are prime numbers and can therefore not be any divided further. Therefore the answer is 7.

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8y ago

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the number is 4

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12y ago
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Q: What is the greatest common factor of 21 and 77 and 84?
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