1 and 200
2 and 100
4 and 50
5 and 40
8 and 25
10 and 20
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The factor pairs of 28 are :28,114,27,4
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).
The factor pairs of 20 are pairs of numbers that can be multiplied together to give 20. The factor pairs of 20 are (1, 20), (2, 10), and (4, 5). These pairs represent all the possible combinations of numbers that can be multiplied to equal 20.
(16,1)(8,2)(4,4)