This is a ridiculous question, due to the fact that 31 is a Prime number. Therefore, as 31 is not a factor of 30, the highest common factor can only be 1.
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The greatest common factor of 30 and 39 is 3.
The greatest common factor of 30 , 50 = 10
greatest common factor of 110 and 30 is 10.
The greatest common factor of 16 and 30 is 2
The greatest common factor (GCF) is: 5.