Complete the letter series: A, C, F, J, ?
Correct answer: C. O
- A. M
- B. N
- C. O
- D. P
Explanation
The gaps between the letters grow by one each step: A to C skips one letter, C to F skips two, F to J skips three, so the next step skips four and lands on O. Writing the alphabet with position numbers turns this into the numeric series 1, 3, 6, 10, 15, which is the triangular numbers. The answer M comes from assuming a constant gap of three.
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About Letter, Symbol and Number Series
Series questions use numbers, letters, symbols or combinations arranged according to a hidden pattern. You may need to identify repeated operations, alternating rules, alphabetical positions, differences, reversals and mixed sequences to find a missing term or predict the next one.
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