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The answer is 1 because 7 is a Prime number which means that it's only factors are 1 and itself which is 7.
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That is just a rubbish answer. The key is not whether one of the numbers is prime but whether the numbers in the set are co-prime.
GCF(7, 42) = 7.
Although 7 is a prime and divides itself, it also divides 42.
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Related Questions
What is the GCF of 42 and 7?
Since 7 is a factor of 42, it is automatically the GCF.
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The GCF of 42 and 35 is 7.factors of 42: 2,6,7factors of 35: 5,7
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The GCF of 7, 42, and 70 is 7.The GCF is 7.
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GCF of 42 and 112 and 105 is 7.
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