What will be next in the series? O, T, T, F, F, S, S ,_ ,_ ,_ ; ?
E (eight) N (nine) T (ten)
E,N,T : These are the first letters of the numbers.
What's next in the following series - A) 3, 3, 5, 4, 4, 3, 5 ..., B) O, T, T, F, F, S, S, ... (HINT - they are related)