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To get the Greates Common Factor (GCF) of 121 and 1156 we need to factor each value first and then we choose all the copies of factors and multiply them:
|121: || || ||11||11|| || |
|1156: ||2||2|| || ||17||17|
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1