What letter comes next in the series A, C, F, J, O, ?

SCorrect answerYour answerTCorrect answerYour answerUCorrect answerYour answerVCorrect answerYour answer

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CorrectNot quiteAnswer C

Correct answer: C

Count the steps through the alphabet between consecutive letters: A to C is 2, C to F is 3, F to J is 4, J to O is 5.
The steps are growing by one each time, so the next step is 6.
O is the 15th letter, and $15 + 6 = 21$ , which is U.

Worth noting

Writing the position numbers — 1, 3, 6, 10, 15 — turns a letter series into a number series. Those are the triangular numbers, so the next is 21.

Ten questions from Number and Letter Series, at your own pace.

Ten questions from Number and Letter Series, at your own pace.

Explanation