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Question

Select the alphanumeric-cluster that can replace the question mark (?) in the following series.

B4D, C9I, D16P, ?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
E25Y

Series Pattern Analysis: B4D, C9I, D16P, ?

To find the missing alphanumeric cluster in the series B4D, C9I, D16P, ?, we need to analyze the pattern for each component: the first letter, the number, and the second letter.

First Letter Progression

The first letters in the series are B, C, D. This sequence follows the standard alphabetical order.

Following this pattern, the next letter after D is E.

Number Progression

The numbers in the series are 4, 9, 16.

These numbers are perfect squares: $2^2 = 4$, $3^2 = 9$, $4^2 = 16$.

The next number in the sequence is $5^2$, which equals 25.

Second Letter Progression

The second letters are D, I, P.

Let's find their positions in the English alphabet:

  • D is the 4th letter.
  • I is the 9th letter.
  • P is the 16th letter.

Notice that these positions (4, 9, 16) directly correspond to the numbers in the series.

Since the next number is 25, the next letter must be the 25th letter of the alphabet, which is Y.

Determining the Missing Cluster

Combining the next components identified:

  • First Letter: E
  • Number: 25
  • Second Letter: Y

The missing alphanumeric cluster is E25Y.

Matching with Options

Comparing E25Y with the provided options:

  • Option 1: E5S
  • Option 2: F25Y
  • Option 3: E25Y
  • Option 4: E25T

The cluster E25Y matches Option 3.

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Similar Questions

  1. Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
    GBD 14, KFH 17, OJL 20, SNP 23, ?
  2. Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
    KFU-15 IIQ-22 GLM-31 EOI-42 ?
  3. Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

    HYP 8, LCT 15, PGX 29, TKB 57, XOF 113, ?
  4. Which option will replace the question mark in the below series?
    A25 : Y1 :: L14 : ?
  5. Select the option that can replace the question mark (?) in the given series.

    P3L, N5N, L7P, J11R, H13T, ?
  6. Select the set that can replace the question marks (?) in the following series.

     $\displaystyle \frac{\text{D}}{23} \; \frac{20}{\text{G}} \; \frac{\text{J}}{17} \; \frac{14}{\text{M}} \; \frac{\text{P}}{11} \; \frac{\text{?}}{\text{?}}$

  7. Select the term that can replace the question mark (?) in the following series.

    B3, D10, F17, H24, ?
  8. Select the alphanumeric-cluster that can replace the question mark (?) in the following series.

    A9B, C49D, E121F, ?
  9. Four letter-pairs have been given, out of which three are alike in some manner and one is different. Select the odd one.
  10. Study the given series carefully and select the option that will come next (in place of the question marks).

    $\frac{\text{C}}{29} \frac{25}{\text{F}} \frac{\text{I}}{21} \frac{17}{\text{L}} \frac{\text{O}}{13} \frac{\text{?}}{\text{?}}$

Important Questions from Letter and Number Based

  1. Select the option in which the numbers are related in the same way as are the numbers of the following set.

    (4, 8, 16)

  2. Select the option that is related to the third number in the same way as the second number is related to the first number.

    23 : 441 : : 28 : ?

  3. Select the option that is related to the third number in the same way as the second number is related to the first number and the sixth number is related to the fifth number.

    12 : 72 ∷ 18 : ? ∷22 : 242
  4. Select the option that is related to the third number in the same way as the second number is related to the first number.

    7 : 56 :: 11 : ?

  5. Select the option in which the numbers are related in the same way as are the numbers of the following set.

    (12, 60, 84)

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