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To get the Greates Common Factor (GCF) of 119 and 918 we need to factor each value first and then we choose all the copies of factors and multiply them:
|119: || || || || ||7||17|
|918: ||2||3||3||3|| ||17|
|GCF: || || || || || ||17|
The Greates Common Factor (GCF) is: 17