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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) K N C G I N F Z X I J X M N W T K K S V V (Right)
How many such consonants are there, each of which is immediately preceded by a vowel and also immediately followed by a consonant?

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

The question asks us to count the number of consonants in the given series that satisfy a specific condition: being immediately preceded by a vowel and immediately followed by a consonant.

Identifying the Pattern

The required pattern is: Vowel - Consonant - Consonant (VCC). We need to find and count the middle consonant in this sequence within the given letter series.

The given letter series is:

K N C G I N F Z X I J X M N W T K K S V V

Vowels are: A, E, I, O, U.

Consonants are all other letters.

Analyzing the Series

Let's examine the series step-by-step to find occurrences of the VCC pattern:

  1. K N C G... : No vowel precedes K, N, or C.
  2. ...G I N F... : Here, 'I' is a vowel, 'N' is a consonant, and 'F' (the next letter) is also a consonant. This fits the VCC pattern (I N F). The consonant 'N' meets the criteria. Count = 1.
  3. ...I N F... : This is the same instance identified above.
  4. ...N F Z... : 'N' is a consonant, so it cannot be preceded by a vowel.
  5. ...F Z X... : 'F' is a consonant.
  6. ...Z X I... : 'Z' is a consonant.
  7. ...X I J X... : Here, 'I' is a vowel, 'J' is a consonant, and 'X' (the next letter) is also a consonant. This fits the VCC pattern (I J X). The consonant 'J' meets the criteria. Count = 2.
  8. ...I J X... : This is the same instance identified above.
  9. ...J X M... : 'J' is a consonant.
  10. The remaining letters (M N W T K K S V V) do not have a vowel immediately preceding them.

Conclusion

By analyzing the series for the Vowel-Consonant-Consonant (VCC) pattern, we found two consonants ('N' between 'I' and 'F', and 'J' between 'I' and 'X') that satisfy the given conditions.

Therefore, there are Two such consonants.

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