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To get the Greates Common Factor (GCF) of 3850 and 2475 we need to factor each value first and then we choose all the copies of factors and multiply them:
|3850: ||2|| || ||5||5||7||11|
|2475: || ||3||3||5||5|| ||11|
|GCF: || || || ||5||5|| ||11|
The Greates Common Factor (GCF) is: 5 x 5 x 11 = 275