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30 = 2 x 3 x 5

35 = 5 x 7

36 = 2^2 x 3^3

42 = 2 x 3 x 7

To find the greatest common factor, we must multiply all the common factors.

GCF = 1

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Bashar Salim

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Q: What is the greatest common factor of 30 35 36 and 42?
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