7 is a prime so it can be multiplied by its self so 1,7
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1 and 14, 2 and 7
There are 3 factor pairs of 63:63 = 1 x 6363 = 3 x 2163 = 7 x 9
There are 3 factor pairs of 28. 28 = 1 x 28 28 = 2 x 14 28 = 4 x 7
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12
1, 28 2, 14 4, 7