None of these numbers are prime:
91 is divisible by 7
117 is divisible by 3
84 and 156 are both divisible by 2
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The GCF of 84 and 156 is 12.First, find the prime factors:84 = 2*2*3*7156 = 2*2*3*13Then, to determine the gcf, multiply the shared prime factors:GCF = 2*2*3 = 12
73-39+84 = 117
84 is not a prime. All numbers ending in four are composite.
7
If two prime number have a sum of 54 they cannot have a sum of 84, and conversely.