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1 is the Greatest Common Factor of 2,7 and 8.

Let us first write the factors of all these numbers.

2 : 1,2.

7 : 1,7.

8 : 1,8,2,4.

Now, If you look at the common factors of 2 and 8, you have 1 and 2. but, if you look at the common factors of 2 and 7 or 7 and 8, 1 is the only common factor.

So, all the three numbers have 1 as their common factor.

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