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-- The factors of 20 are 1, 2, 4, 5, 10, and 20.

-- The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36.

-- The (common) factors of both 20 and 36 are 1, 2, and 4 .

-- The greatest one of the common factors (GCF) of 20 and 36 is 4 .

The answer has got to be somewhere in here.

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12y ago

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