Q: What is the gcf of 3mn 9mn and 12mn?

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The GCF of 3mn, 9mn, and 12mn is 3mn.

The GCF is 3.

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There is no answer to the question, because there is no question in the question.

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I'm a girl and i would say 1mn-3mn

It is certainly not an equation since there is no equality sign in evidence anywhere. It could be non-linear.

Suppose x and y are any two elements of the set.Then x = 3m + 1 and y = 3n + 1 for some integers m and n. Then x*y = (3m + 1)*(3n + 1) = 9mn + 3m + 3n + 1 = 3*(3mn + m + n) + 1. Since m and n are integers, mn+ m + n is also an integer = p, say. Then x*y = 3p + 1. That is the set is closed under multiplication.