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The question is stated wrong.It should be: "What is the next letter in the series O T T F F ?", and the answer is " S ".These are the initial letters of the words: One Two Three Four Five, followed by Six.
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It looks as if every third letter is an "r"; the remaining letters are in sequence.
E. They are the initial letters of the numbers 0-7 in words: Zero, One, Two, Seven The next is 8 - Eight
oNe, tWo, tHree, fOur,fIve,sIx etc. It is the second letter of each consecutive number