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the factors of 6 are 1, 2, 3, and 6.
6 + 2 = 8
some people might not consider 1 and 6 to be factors of 6. however, the definition of a factor is "any whole number that can be divided into a number n, in which the quotient is another whole number" (6 would be n in this case)
The factors of 21 are 1, 3, 7 and 21. No two of them add up to 21.
two prime numbers when added together will equal 63: 2 + 61
-3 and 6
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