In the letter series C, F, I, L, P, R, one letter is wrong. Which one?

FCorrect answerYour answerICorrect answerYour answerPCorrect answerYour answerRCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Positions: C = 3, F = 6, I = 9, L = 12, P = 16, R = 18.
The jump is 3 each time, so after L (12) should come O (15), and then R (18) fits.
P (16) is the wrong letter; it should be O.

Worth noting

Writing the positions turns the letter series into 3, 6, 9, 12, 16, 18, where the odd term is easy to see.

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

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

Explanation