3+9, 4+8,5+7,6+6
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1+2+3+6 is one possible answer.
Factors of 12 are: 1/12, 2/6 and 3/4. Only set which add up to 7 are 3 & 4.
4950
when you add the numbers it will add up to a multiple of 3. Lets say 12 1+2=3 or 36 3+6=9, they are all multiples of 3.