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To get the Greates Common Factor (GCF) of 11319 and 9702 we need to factor each value first and then we choose all the copies of factors and multiply them:
|11319: || ||3|| ||7||7||7||11|
|9702: ||2||3||3||7||7|| ||11|
|GCF: || ||3|| ||7||7|| ||11|
The Greates Common Factor (GCF) is: 3 x 7 x 7 x 11 = 1617