Infosys Company Logical Reasoning Missing Character

O,T,T,F,F,S,S,?,?.

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There are 27 coins and a two-pan balance. All coins has same weight except for one, which is heavier than all others. All coins looks identical. What is the minimum number of weighing required to certainly find out heavier coin? find sum of 3+5/(1+2^2)+7/(1+2^2+3^2)+.......