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Question

Select the letter-cluster from among the given options that can replace the question mark (?) in the given series.
ACE, HJL, OQS, ?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
VXZ

Letter Series Reasoning: Finding the Next Cluster

Pattern Analysis

The question presents a series of three-letter clusters: ACE, HJL, OQS. We need to find the next cluster in the sequence by identifying the pattern governing the progression of letters.

Let's analyze the position of each letter in the alphabet (A=1, B=2, C=3,...).

  • ACE: A (1), C (3), E (5)
  • HJL: H (8), J (10), L (12)
  • OQS: O (15), Q (17), S (19)

Step-by-Step Solution

We examine the difference between the corresponding letters of consecutive clusters.

  1. First Letters: A (1) $\rightarrow$ H (8) $\rightarrow$ O (15)
    • The difference is $8 - 1 = 7$.
    • The difference is $15 - 8 = 7$.
    • The pattern for the first letter is adding 7 to the previous letter's position.
    • The next first letter's position will be $15 + 7 = 22$. The 22nd letter is V.
  2. Second Letters: C (3) $\rightarrow$ J (10) $\rightarrow$ Q (17)
    • The difference is $10 - 3 = 7$.
    • The difference is $17 - 10 = 7$.
    • The pattern for the second letter is also adding 7.
    • The next second letter's position will be $17 + 7 = 24$. The 24th letter is X.
  3. Third Letters: E (5) $\rightarrow$ L (12) $\rightarrow$ S (19)
    • The difference is $12 - 5 = 7$.
    • The difference is $19 - 12 = 7$.
    • The pattern for the third letter is also adding 7.
    • The next third letter's position will be $19 + 7 = 26$. The 26th letter is Z.

Combining the next letters (V, X, Z), the missing cluster is VXZ.

Therefore, the correct option is the one containing VXZ.

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