1 and 3
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The common factors of 51 and 39 are 1 and 3.
GCF means Greatest Common Factor. GCF of 51 and 255 will be, = 255/ 51 = 5. So, 255 is divisible by 51. So, the answer is 51. or, Factors of 51 is = 17x3 Factors of 255 is = 3x5x17 So the common factors are 3x17 which is 51.
The common factors of 34 and 51 are 1 and 17.
1 and 3
The factors of 34 are:1, 2, 17, 34The factors of 51 are:1, 3, 17, 51The common factors are:1, 17The Greatest Common Factor:GCF = 17