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12, 16 and 18.

(12,1)(6,2)(4,3)

(16,1)(8,2)(4,4)

(18,1)(9,2)(6,3)

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9y ago
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Wiki User

14y ago

Only 12 (1,12), (2,6), (3,4)

and 18 (1,18), (2,9), (3,6).

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Q: What numbers have 3 factor pairs that are less than 20?
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