CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
Find the next term in the series: A, C, F, J, O, ?
The next letter is U. The letter positions are 1, 3, 6, 10, 15, which are triangular numbers, with the gaps increasing by one each time. The next gap is 6, so 15 + 6 = 21, which is the letter U.
- AT
- BUCorrect
- CV
- DS
Explanation
Positions are 1, 3, 6, 10, 15. The differences are 2, 3, 4, 5, so the next difference is 6. 15 + 6 = 21, which is U. Option T (20) uses a difference of 5 again.
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