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Question

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

This question was previously asked in
SSC CGL 2025 Tier 1 Question Paper (25-Sep-2025) (Shift 3)
The correct answer is

O

Series Pattern Analysis

To find the next term in the letter series A, C, F, J, we analyze the interval between consecutive letters.

  • A to C: Skip 1 letter (B). Difference is +2 positions.
  • C to F: Skip 2 letters (D, E). Difference is +3 positions.
  • F to J: Skip 3 letters (G, H, I). Difference is +4 positions.

The pattern shows an increasing number of skipped letters (or an increasing positional difference): +2, +3, +4. To find the next term, we continue this sequence.

  • The next interval must be +5 positions.
  • Starting from J (the 10th letter), add 5 positions: 10 + 5 = 15.
  • The 15th letter of the alphabet is O.

Thus, the next letter in the series is O.

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Similar Questions

  1. Which of the following alternative will fill the blanks?
    _f_hk_gh_fg_k
  2. In the sequence A, C, F, J..., which letter is the $5^{th}$?
  3. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series:
    M C K J H N G M Q D R T ?
  4. What comes next in the series?
    D, I, N, S, ?
  5. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series:
    ACE, BDF, CEG, ?
  6. What comes next in the series? 

    A, C, F, J, O, ?

  7. What comes next? 

    LM, KN, JO, IP, ?

  8. What comes next?
    AG, BH, CI, ?
  9. Which letter trio does NOT follow the ascending order? ABC, BCD, CDE, DFE, EFG


Important Questions from Letter Based Series

  1. Select the option that represents the letters that when placed from left to right in the blanks below will complete the given letter series.

    M N _ O J K M _ Q O J K _ N Q _ J K M N Q O _ K M N

  2. Select the option that represents the letters that when placed from left to right in the blanks below will complete the given letter series. 

    B _ E N B _ C E N B B C _ N B B C E _ B _ C

  3. Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.

    MSD: NHW :: OAE : LZV :: NIP : ?

  4. Select the option that represents the letters that when sequentially placed from left to right in the blanks below will complete the letter series.

    Y _ Y _ _ Y _ T _ Y _ Y

  5. Select the option that represents the letters that when sequentially placed from left to right in the blanks below will complete the letter series.

    Y _ Y _ _ Y _ T _ Y _ Y

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