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Answered 2011-12-07 09:12:26

1 & 21, and 3 & 7

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The factor pairs for 21 are1 x 21 and 3 x 7


How many factor pairs does 21 have?

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(21,1)(7,3) (42,1)(21,2)(14,3)(7,6) Since 21 is a factor of 42, all the factors of 21 will be included in the factor pairs of 42.


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