12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).
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1 and 12, 2 and 6, 3 and 4
The factor pairs of 28 are :28,114,27,4
12, 16, 18
There are 3 factor pairs of 20: 1 x 20, 2 x 10 and 4 x 5.
its a factor with two pairs of the same number