40 has four factor pairs:
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1x40 2x20 4x10 5x8
The factor pairs of 28 are :28,114,27,4
because if you divide 40 by 1,2,4,and5 you will get the answer (and what about 8, 10, 20, and 40 ? are they nothing but chopped liver ?)
its a factor with two pairs of the same number
12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).