Greatest common factor(GCF) of two consecutive even numbers is 2. The reason behind this is that both the numbers(even numbers) are divisible by 2, so 2 is the common factor. Also, both numbers differ by 2 so 2 is the only common factor except 1.
If the difference is 4 then it may be possible that both numbers are divisible by 4.
So, if the difference between two numbers is n then it may be possible that both the numbers are divisible by n and numbers less than n.
52 and 54 are two consecutive even numbers so their GCF is 2.
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