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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.

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12y ago
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10y ago

Given any set of numbers, there is only one GCF for them. The sum of that single number will be itself so there is really not much to the sum: it is the GCF.

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