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To get the Greates Common Factor (GCF) of 8085 and 6930 we need to factor each value first and then we choose all the copies of factors and multiply them:
|8085: || ||3|| ||5||7||7||11|
|6930: ||2||3||3||5||7|| ||11|
|GCF: || ||3|| ||5||7|| ||11|
The Greates Common Factor (GCF) is: 3 x 5 x 7 x 11 = 1155