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To get the Greates Common Factor (GCF) of 3993 and 297 we need to factor each value first and then we choose all the copies of factors and multiply them:
|3993: ||3|| || ||11||11||11|
|297: ||3||3||3||11|| || |
|GCF: ||3|| || ||11|| || |
The Greates Common Factor (GCF) is: 3 x 11 = 33