1, 2, 3, 6
1, 7
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4, yes.6, no.
The greatest factor of these numbers is the number 6, which is a factor of 6 - though not of the other two numbers.
4 3 and 6 have no proper factor in common. Remember that 1 is a factor of every counting number, but not a proper factor of any of them. Greatest common factor questions do not recognise 1 as a proper factor. When talking of primes neither 1 nor the number itself is regarded as a proper factor.
the answer is 4
12/2 = 6