2(24 + 7)
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3 (21+5)
The sum is 84 and the GCF is 6
The Greatest Common Factor is 3
You cannot. LCM{2,6,12} = 12 and GCF{2,6,12} = 2 LCM{4,6,12} = 12 and GCF{4,6,12} = 2 The two sets have the same LCM and GCF but, clearly, their sums are different.
3 is a common factor but not the Greatest common factor.