The GCF is 14.
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The greatest common factor of 170 and 210 is 10
The greatest common factor of 105, 126, and 210 is 21
The GCF of 210, 252, and 294 is 42
210
The greatest common factor of 2940 and 3150 is 210. Source: http://www.mathwarehouse.com/arithmetic/numbers/GCF/greatest-common-factor-calculator.php