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Mathematically speaking a proper factor is a positive number you can multiply by which you can get a positive result. For example 2 and 3 are proper factors of 6. Look here for more
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Proper factors are factors of a number that do not include 1 or the number itself. For example, all the factors of 16 are 1, 2, 4, 8, and 16. The proper factors are 2,4,8 because
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2, 4, 11, 22.
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3 and 13.
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