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Question

Refer to the given letter series and answer the question that follows. Counting to be done from left to right only.
(Left) H S A N D D I A D F P A J O S K I O Z O T X (Right)
How many such consonants are there, each of which is immediately preceded by a consonant and also immediately followed by a vowel?

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

Four

To solve the problem, we need to count the number of consonants in the given series where each consonant is immediately preceded by another consonant and immediately followed by a vowel. Let's analyze step-by-step:

  1. First, identify all the consonants and vowels in the series: H, S, A, N, D, D, I, A, D, F, P, A, J, O, S, K, I, O, Z, O, T, X.
  2. List the vowels separately: A, I, A, O, I, O, O.
  3. Now, find the consonants that meet the criteria:
    • The first consonant cannot have a preceding consonant, so we start checking from the second letter.
    • Check each triplet combination of (consonant, consonant, vowel) as you move along the series.

Let's identify such combinations:

  • N D D: D is a consonant, preceded by N (consonant) and followed by A (vowel).
  • D D I: D is a consonant, preceded by D (consonant) and followed by I (vowel).
  • D F P: F is a consonant, preceded by D (consonant) and followed by A (vowel).
  • S K I: K is a consonant, preceded by S (consonant) and followed by I (vowel).

Through this examination, we find that there are four consonants (D, D, F, K) matching the criteria.

Therefore, the correct answer is: Four.

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Similar Questions

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

    (Left) A T D E B R C L M Q O N P J M Q E A O Z W F U K S L (Right)

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

  2. What should come in place of the question mark (?) in the given series based on the English alphabetical order? 

    UMD ZQG EUJ JYM ?

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

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Important Questions from Alphabet Series

  1. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    G _ C T _ X _ T G X _ T _ X C T G _ C T

  2. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    Q _ P _ M _ A _ T _ Q A _ T M

  3. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    r _ x l _ q _ _ x _ p q _ e _ l p _

  4. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

    BKR, DNV, FQZ, ?, JWH

  5. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

    AU, BO, CI, DE, ?

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