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E.

They are the initial letters of the numbers 0-7 in words: Zero, One, Two, Seven

The next is 8 - Eight

Q: What is the next letter in this series of ZOTTFFSS?

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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.

d

It looks as if every third letter is an "r"; the remaining letters are in sequence.

oNe, tWo, tHree, fOur,fIve,sIx etc. It is the second letter of each consecutive number

The pre-penultimate element of the series.

Related questions

what is the next letter e h l q

X

S

c

Q

c is next

y

E

S

T

The next (and last) letter is C. Just as a countdown counts backwards, this series is "countdown" spelled backwards.

It's the letter D of course! Haven't you heard of Jason D?!