Question

Next Letter in the Series O, T, T, F, F, S, S, E, ?
Find the next letter in the series? O, T, T, F, F, S, S, E, ?

Answer 1

o-one and t-two and t-three and f-four and f-five and s-six and s-seven and e-eight and n-nine      so answer is o,t,t,f,f,s,s,e,n