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Question

Select the option that can replace the question mark (?) in the following series.
D3K, E5J, F7I, G11H, ?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
H13G

Series D3K Pattern Analysis

The question presents a series: D3K, E5J, F7I, G11H, ?. The task is to identify the underlying pattern and determine the missing term.

Letter and Number Sequence Logic

We analyze the pattern by looking at the changes in the first letter, the number, and the last letter separately:

  • First Letter Progression: The first letters D, E, F, G are consecutive letters in the English alphabet. Following this pattern, the next letter is H.
  • Number Progression: The numbers 3, 5, 7, 11 are consecutive prime numbers. The prime number sequence starts with 2, 3, 5, 7, 11, 13, 17, ... The next prime number after 11 is 13.
  • Last Letter Progression: The last letters K, J, I, H are consecutive letters in reverse alphabetical order. The next letter after H in reverse order is G.

Determining the Missing Term

By combining the next elements derived from each sequence:

  • Next First Letter: H
  • Next Number: 13
  • Next Last Letter: G

Combining these results gives the missing term: H13G.

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Similar Questions

  1. Select the alphanumeric-cluster from among the given options that can replace the question mark (?) in the given series.
    G7H, I9J, K11L, ?
  2. A series is given with one term missing. Select the correct alternative from the given options that will complete the series. 

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Important Questions from Alpha-numeric series

  1. Consider the following sequence of numbers: 5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 How many odd numbers are followed by the odd number in the above sequence?

  2. Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? _sr_tr_srs_r_srst_

  3. Find the missing number in the following series: 43, 172, 86, 344, ?

  4. Select the missing numbers from the given alternatives

  5. How many such pairs of letters are there in the word JOURNEY (in forward direction), each of which has as many letter in the same sequence between them in the word as in the English alphabet?

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