It is hard to tell for sure, but one possibility is 2n-1/n
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6/24 is the odd one out.
2/3 = 0.66666666... (the sixes continue forever).
13/125/12 + 2/3= (5 + 8)/12= 13/12
5/6 is bigger than 2/3 (2/3 = 4/6, which is less than 5/6)
They add up to 25/6 and (25/6)/9 = 25/54 which is the mean