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1 solution
In the series OTN - 129, TFE - 248, TSS - 367, You see that the 1st digit comes in the order 1,2,3,4,5,6,8,9 . The 2nd digit comes when you multiply the first digit ×2. The 3rd didit comes in the order 9,8,7,6,5,4,3,2,1. So the next term is FES - 486