4
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Examine the following sequence:

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

Can you determine what comes next?

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  • 2
    $\begingroup$ Too easy :-) This is a very common riddle. $\endgroup$ – Mr. Mascaro Nov 7 '14 at 19:39
16
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N

Explanation:

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

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