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TSO
The greatest common factor of 4ab and 8a^3 is 4a.

Your answer is C.

That is because the highest number you can divide 4ab and 8a^3 by is 4a.
apologiabiology
factor them and see which ones are in both

4ab=2*2*a*b
8a^2=2*2*2*a*a*a

common one is 2*2*a=4a

answer is C

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