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To get the Greates Common Factor (GCF) of 6786 and 156 we need to factor each value first and then we choose all the copies of factors and multiply them:
|6786: ||2|| ||3||3||13||29|
|156: ||2||2||3|| ||13|| |
|GCF: ||2|| ||3|| ||13|| |
The Greates Common Factor (GCF) is: 2 x 3 x 13 = 78