What are the next two letters in the series?
E, O, E, R, E, X, N, T, E, _, _
Answer: The next two letters in the series are N and N
The pattern is - Last letter of the numbers starting from 1 when written in English i.e. onE, twO, threE, fouR, fivE, siX, seveN, eighT, ninE, teN, eleveN, twelvE, etc...