The factors of 10 are 1, 2, 5, and 10. Among these, the pairs whose sum is 7 are 1 and 6, and 2 and 5. These pairs are factors of 10 as they divide evenly into 10 without leaving a remainder.
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7 and 6
4nd 9.
105 is the sum
1.61013 and 17.38987 (approx).
There are no two primes whose sum is 209.