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Question

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

DKR 79, HOV 73, LSZ 67, PWD 61, TAH 55, ?

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
XEL 49

Logical Pattern Analysis of the Series

The given series consists of letter-number clusters: DKR 79, HOV 73, LSZ 67, PWD 61, TAH 55, ? We need to identify the pattern to find the missing cluster.

Letter Pattern Breakdown

Let's analyze the patterns for each position in the letter clusters:

  • First Letter: D, H, L, P, T
  • Second Letter: K, O, S, W, A
  • Third Letter: R, V, Z, D, H

We observe a consistent increment of 4 positions in the alphabet for each subsequent letter within its position:

  • First Letter: D (+4) $\rightarrow$ H (+4) $\rightarrow$ L (+4) $\rightarrow$ P (+4) $\rightarrow$ T. The next letter is T (+4) $\rightarrow$ X.
  • Second Letter: K (+4) $\rightarrow$ O (+4) $\rightarrow$ S (+4) $\rightarrow$ W (+4) $\rightarrow$ A (W is 23, +4 = 27; 27 mod 26 = 1, which is A). The next letter is A (+4) $\rightarrow$ E.
  • Third Letter: R (+4) $\rightarrow$ V (+4) $\rightarrow$ Z (+4) $\rightarrow$ D (Z is 26, +4 = 30; 30 mod 26 = 4, which is D) (+4) $\rightarrow$ H. The next letter is H (+4) $\rightarrow$ L.

Combining these, the next letter cluster is XEL.

Number Pattern Breakdown

The numbers in the series are: 79, 73, 67, 61, 55.

Let's find the difference between consecutive numbers:

  • 79 - 6 = 73
  • 73 - 6 = 67
  • 67 - 6 = 61
  • 61 - 6 = 55

The pattern is a subtraction of 6 from the previous number. The next number is 55 - 6 = 49.

Conclusion

Combining the next letter cluster (XEL) and the next number (49), the complete cluster that replaces the question mark is XEL 49.

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Similar Questions

  1. Select the number from among the given options that will come next in the following series.

     $20, 40, 63, 90, 122,$ _____

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Important Questions from Series

  1. Select the option figure in which the given figure (X) is embedded (rotation is NOT allowed).

  2. Identify the figure given in the options which when put in place of ? will logically complete the series.

  3. When is a series of terms said to be in the order of increasing extension?

    (A) When each term in the series (except the first) denotes a class having more members than a class denoted by the term preceding it.

    (B) When the class size gets larger with each successive term.

    (C) When each term in the series (except the first) denotes a class having fewer members than the class denoted by the term preceding it.

    (D) When the class size gets smaller with each successive term

    Choose the most appropriate answer from the options given below :

  4. In the following question, select the missing number from the given series.

    5, 10, 17, 26, 37, ?, 65

  5. In the following question, select the missing number from the given series.

    5, 10, 17, 26, 37, ?, 65

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