(1, 65) and (5, 13)
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The number 18.
12 and 18 have three factor pairs.
The Factors of 65 are 1, 5, 13, and 65. The factor pairs of 65 are 1 x 65, and 5 x 13.
Factor pairs are just the factors of a number listed in a different way. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
For every factor of a number, there is another factor that results when you divide the first factor into the number. Factors can be listed in pairs. Since 9 x 4 = 36, (9,4) is a factor pair of 36.