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To get the Greates Common Factor (GCF) of 195 and 1092 we need to factor each value first and then we choose all the copies of factors and multiply them:
|195: || || ||3||5|| ||13|
|1092: ||2||2||3|| ||7||13|
|GCF: || || ||3|| || ||13|
The Greates Common Factor (GCF) is: 3 x 13 = 39