Factors: 1, 3, 9, 27.
Pairs: (1,27);(3,9).
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The positive integer factors of 243 are 1, 3, 9, 27, 81, and 243 The factor pairs of 243 are (1, 243), (3, 81), and (9, 27).
(27,1)(9,3)
How they're listed. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
The factors of 8 are: 1,2,4,and 8. The factor pairs of 8 are: 1x8 2x4 These are the only two factor pairs
The factor pairs of 135 are: 1, 135 3, 45 5, 27 9, 15