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Question

Refer to the following letter series and answer the question that follows. Counting to be done from left to right only.

(Left) T O W A Q D F H G U K S I C X Z O F H G U K I S (Right)

How many such consonants are there, each of which is immediately preceded by a vowel and also immediately followed by a vowel?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
Two

Problem Analysis:

We need to identify the number of consonants in the given letter series that satisfy a specific condition: being immediately preceded by a vowel and immediately followed by a vowel. The series is: \(T O W A Q D F H G U K S I C X Z O F H G U K I S\). Counting is from left to right.

First, let's define the sets of vowels and consonants:

  • Vowels (\(V\)): {A, E, I, O, U}
  • Consonants (\(C\)): {B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z}

The condition we are looking for is the pattern: Vowel - Consonant - Vowel.

Finding Consonants Meeting the Criteria

We will scan the series from left to right to find occurrences of the pattern V-C-V:

  • \(T O W A\): Here, 'W' is a consonant. It is preceded by 'O' (Vowel) and followed by 'A' (Vowel). This matches the pattern (V-C-V). Count: 1.
  • \(O W A Q\): 'A' is a vowel.
  • \(W A Q D\): 'Q' is a consonant. It is preceded by 'A' (Vowel) but followed by 'D' (Consonant). Does not match (V-C-C).
  • \(A Q D F\): 'D' is a consonant. Preceded by 'Q' (Consonant). Does not match.
  • \(Q D F H\): 'F' is a consonant. Preceded by 'D' (Consonant). Does not match.
  • \(D F H G\): 'H' is a consonant. Preceded by 'F' (Consonant). Does not match.
  • \(F H G U\): 'G' is a consonant. Preceded by 'H' (Consonant). Does not match.
  • \(H G U K\): 'U' is a vowel.
  • \(G U K S\): 'K' is a consonant. Preceded by 'U' (Vowel) but followed by 'S' (Consonant). Does not match (V-C-C).
  • \(U K S I\): 'S' is a consonant. Preceded by 'K' (Consonant). Does not match.
  • \(K S I C\): 'I' is a vowel.
  • \(S I C X\): 'C' is a consonant. Preceded by 'I' (Vowel) but followed by 'X' (Consonant). Does not match (V-C-C).
  • \(I C X Z\): 'X' is a consonant. Preceded by 'C' (Consonant). Does not match.
  • \(C X Z O\): 'Z' is a consonant. Preceded by 'X' (Consonant). Does not match.
  • \(X Z O F\): 'O' is a vowel.
  • \(Z O F H\): 'F' is a consonant. Preceded by 'O' (Vowel) but followed by 'H' (Consonant). Does not match (V-C-C).
  • \(O F H G\): 'H' is a consonant. Preceded by 'F' (Consonant). Does not match.
  • \(F H G U\): 'G' is a consonant. Preceded by 'H' (Consonant). Does not match.
  • \(H G U K\): 'U' is a vowel.
  • \(G U K I\): Here, 'K' is a consonant. It is preceded by 'U' (Vowel) and followed by 'I' (Vowel). This matches the pattern (V-C-V). Count: 2.
  • \(U K I S\): 'I' is a vowel.

Final Count

By examining the series, we found two consonants ('W' in the sequence OWA and 'K' in the sequence UKIS) that are immediately preceded by a vowel and immediately followed by a vowel.

Therefore, the total count is 2.

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