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The greatest common factor of 42 and 78 is 6
Express each number in terms of its prime factors.
78 = 2 x 3 x 13
42 = 2 x 3 x 7
The common factors are 2 and 3 therefore the GCF = 2 x 3 = 6
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoGCF(42, 78) = 6.
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