(21,1)(7,3)
(42,1)(21,2)(14,3)(7,6)
Since 21 is a factor of 42, all the factors of 21 will be included in the factor pairs of 42.
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They are:16 = 1 x 1616 = 2 x 816 = 4 x 4
The factor pairs of 51 are: 1 x 51 3 x 17
Aside from itself (21), the highest integer factor of 21 is 7.
The only common factor of all three numbers is 3. (The numbers 21 and 63 share all of the factors of 21 : 1, 3, 7, and 21.)
Since 21 is a factor of 147, it is automatically the GCF.