The GCF is 4.
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the greatest common factor of 8n and 18n is 2n
The common factors of 12 and 14 are 1 and 21 and 2
Common factors of 12 & 64 are 1, 2 and 4.
Common factors of 12, 15, and 18 are: 1 and 3.
Since 12 is a factor of 84, all of its factors are common.