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Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90 Factors of 180 are 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180 The factors of 90 and 180 not common to both numbers are 4, 12, 20, 36, 60, and 180.

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Q: Which is not a common factor of 90 and 180?
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