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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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Q: How do you connect all the factor pair of 21 and 42?
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They are:16 = 1 x 1616 = 2 x 816 = 4 x 4


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The factor pairs of 51 are: 1 x 51 3 x 17


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Aside from itself (21), the highest integer factor of 21 is 7.


Factor pairs of 42?

(1,42) (2,21) (3,14) (6,7)


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The only common factor of all three numbers is 3. (The numbers 21 and 63 share all of the factors of 21 : 1, 3, 7, and 21.)

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