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Question

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

Z, W, T, Q, N, ?

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

Alphabet Series Pattern Recognition

The question asks to identify the next letter in the given alphabetical series: Z, W, T, Q, N, ?

Identifying the Series Pattern

To find the pattern, let's examine the relationship between consecutive letters by considering their positions in the English alphabet:

  • Z is the 26th letter.
  • W is the 23rd letter.
  • T is the 20th letter.
  • Q is the 17th letter.
  • N is the 14th letter.

Now, let's calculate the difference between the positions of consecutive letters:

  • Position(Z) - Position(W) = 26 - 23 = 3
  • Position(W) - Position(T) = 23 - 20 = 3
  • Position(T) - Position(Q) = 20 - 17 = 3
  • Position(Q) - Position(N) = 17 - 14 = 3

The pattern observed is that each letter is 3 positions before the preceding letter in the alphabet.

Calculating the Next Letter

The last known letter in the series is N, which is the 14th letter.

To find the next letter, we subtract 3 from the position of N:

Position(Next Letter) = Position(N) - 3

Position(Next Letter) = 14 - 3 = 11

The 11th letter of the English alphabet is K.

Conclusion

Therefore, the letter that replaces the question mark (?) in the series is K.

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