1, 2, 4, 7, 14, 28
(28,1)(14,2)(7,4)
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There are 3 factor pairs of 28. 28 = 1 x 28 28 = 2 x 14 28 = 4 x 7
The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
1, 28 2, 14 4, 7
(6375,1)(2125,3)(1275,5)(425,15)(375,17)(255,25)(125,51)(85,75)
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12