13/8 + 12/3 = 11/8 + 5/3 = 33/24 + 40/24 = 73/24 = 31/24
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13/125/12 + 2/3= (5 + 8)/12= 13/12
It is hard to tell for sure, but one possibility is 2n-1/n
They add up to 25/6 and (25/6)/9 = 25/54 which is the mean
1/8 plus 1/4 plus 1/2 = 7/8 or 0.875
4 over 8 is the same as 1 over 2, so 1 over 2 plus 1 over 2 (.5+.5 OR 1/2 +1/2) is 1. The answer is 1.