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Question

Determine the next letter cluster in the series.

ABCD, GGGG, MLKJ, ?

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

SQOM

This letter-cluster series needs two rules: one for how the clusters begin and one for how letters move within each cluster.

The first letters of the clusters are A, G, M, ?, and each jumps by six (A→G→M→S), so the next cluster begins with S.

Now look at the internal step of each cluster: ABCD moves +1 between letters, GGGG moves 0 (stays the same), and MLKJ moves -1.

The internal step is decreasing by one each cluster: +1, 0, -1, so the next cluster's internal step is -2.

Starting at S and stepping -2 each time gives S, then \(S-2=Q\), then \(Q-2=O\), then \(O-2=M\).

So the required cluster is S, Q, O, M.

Hence the next letter cluster is SQOM.

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Similar Questions

  1. Complete the following series from the given options.

    x_zxx_yzz_xxyyy_zz

  2. Find the missing term.

    SCD, TEF, UGH, __, WKL

  3. Few of the letters are given followed by a question mark (?) these letters are following a specific pattern you have to give the correct option which can replace question mark.

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  6. What comes next in the series?

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Important Questions from Alphabet Series

  1. A series is given with some letters missing. Choose the correct alternative from the given ones that will complete the series:

    BR __ __ NB __ O __ NB
  2. A series is given with some letters missing. Choose the set of letters which when sequentially placed shall complete it .

    a __ __ dba __ __ bcad __ __ da __ __ cd
  3. In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below It. Choose the correct alternative

    _ a _ b _ abaa _ bab _ abb
  4. In the series _b_a_ba_b_abab_aab;

    fill in the six blanks ( _ ) using one of the following given four choices such that the series follows a specific order.

  5. In the series AABABCABCDABCDE..., which letter appears at the 100th place?

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