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Factors of 8 = [1, 2, 4, 8]

Factors of 42 = [1, 2, 3, 6, 7, 14, 21, 42]

Therefore common factor is 2 since we don't include 1.

(Question is supposed to be 'highest' common factor)

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Q: What is the common factor of 8 and 42?
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