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To get the Greates Common Factor (GCF) of 3105 and 12520 we need to factor each value first and then we choose all the copies of factors and multiply them:
|3105: || || || ||3||3||3||5||23|| |
|12520: ||2||2||2|| || || ||5|| ||313|
|GCF: || || || || || || ||5|| || |
The Greates Common Factor (GCF) is: 5