It is: 12
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If that's 28, 56 and 84, the GCF is 28. If that's 2856 and 84, the GCF is 84.
The GCF is 28.
The GCF is 42.
The GCF is 12.
The same as the GCF of 84 and 12 - where 12 is the remainder, when you divide 96 by 84.