(21,-1)(7,-3)(-21,1)(-7,3)
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The factor pairs of 21 are:1, 213, 7Therefore, the number 21 has two pairs of positive integer factors.
21,17,3
(21,1)(7,3)
1, -1, 3, -3, 7, -7, 21, -21
Factor pairs of 84 are: 2 x 42, 3 x 28, 4 x 21, 6 x 84, 7 x 12