36v+24

Basically, you break the numbers down into their prime factors:

36 = 3 x 3 x 2 x 2
24 = 3 x 2 x 2 x 2

Take the factors that are the same (in common), 3 x 2 x 2 = 12

The greatest common factor is, therefore, 12.

And what answer did you get Hamayun?

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Originally Posted by unknown008

and what answer did you get hamayun?

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I got 12

Hmmm... if I take GCF as being "grouping common factors", I get .