find the factory of 20, ond 40 find the common factor
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The prime factorization of 40 is: 2 x 2 x 2 x 5. The prime factors and multiplicities 20 and 40 have in common are: 2 x 2 x 5. 2 x 2 x 5 is the gcf of 20 and 40. gcf(20,40) = 20.
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The common factors of 20 and 40 are 20, 10, 5, 4, 2, 1, intersecting the two sets above. In the intersection factors of 20 ∩ factors of 40 the greatest element is 20. Therefore, the greatest common factor of 20 and 40 is 20.
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