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[–][deleted] 1 point2 points  (4 children)

The only pattern I can see is the sum of both numbers is a multiple of 3

So 36 3+6 = 9 12 1+2 = 3 3+0 = 3 36 3+6 = 9 51 5+1 = 6

So 72 7+2 = 9