Examine the following sequence:

O, T, T, F, F, S, S, E, ?

Can you determine what comes next?

  • 3
    $\begingroup$ Too easy :-) This is a very common riddle. $\endgroup$ Nov 7, 2014 at 19:39

1 Answer 1




Each letter is the first letter of English counting numbers. One, Two, Three, Four, Five, Six, Seven, Eight, Nine


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