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Question

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

AZ, CX, GT, ?

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

Pattern Analysis for Letter Series AZ, CX, GT, ?

The question presents a series of letter pairs: AZ, CX, GT, and asks for the next term. To solve this, we need to identify the pattern in the alphabetical positions of the letters.

Analyzing First Letters (A, C, G)

  • A is the $1^{st}$ letter of the alphabet.
  • C is the $3^{rd}$ letter of the alphabet.
  • G is the $7^{th}$ letter of the alphabet.

Let's examine the difference between the positions:

  • Position difference between C and A: $3 - 1 = 2$.
  • Position difference between G and C: $7 - 3 = 4$.

The differences are increasing by 2 ($2, 4, \dots$). The next difference should be $4 + 2 = 6$. Therefore, the position of the next first letter is $7 + 6 = 13$. The $13^{th}$ letter of the alphabet is M.

Analyzing Second Letters (Z, X, T)

  • Z is the $26^{th}$ letter of the alphabet.
  • X is the $24^{th}$ letter of the alphabet.
  • T is the $20^{th}$ letter of the alphabet.

Let's examine the difference between the positions:

  • Position difference between X and Z: $24 - 26 = -2$.
  • Position difference between T and X: $20 - 24 = -4$.

The differences are decreasing by 2 ($-2, -4, \dots$). The next difference should be $-4 - 2 = -6$. Therefore, the position of the next second letter is $20 - 6 = 14$. The $14^{th}$ letter of the alphabet is N.

Determining the Missing Term

Combining the next first letter (M) and the next second letter (N), the missing term in the series is MN.

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Similar Questions

  1. Select the letter that can replace the question mark (?) in the following series.

    E, J, O, T, ?
  2. Select the letter cluster that can replace the (?) in the following series.

    DKM, FJP, HIS, JHV, ?
  3. Select the term that can replace the question mark (?) in the following series.

    AC, CF, EJ, GO, ?
  4. Select the term that can replace the question mark (?) in the following series.

    ACE, GIJ, LPO, PXT, ?
  5. Select the letter that can replace the question mark (?) in the following series.
    A, C, E, G, I, K, ?
  6. Select the letter that can replace the question mark (?) in the following series.
    L, J, H, F, D, ?
  7. Select the letter that can replace the question mark (?) in the figure below.

  8. Which of the following options is 6th to the right of the 17th letter from the left in the English alphabet?

  9. Identify the letter that does NOT belong to the following series.

    $\text{X, U, Q, M, F, Y}$
  10. If every ${4}^{th}$ letter going from left to right of the English alphabet is deleted, then what would be the ${5}^{th}$ letter from the right in the new series obtained?


Important Questions from Alphabet Series

  1. A series is given with some letters missing. Choose the correct alternative from the given ones that will complete the series:

    BR __ __ NB __ O __ NB
  2. A series is given with some letters missing. Choose the set of letters which when sequentially placed shall complete it .

    a __ __ dba __ __ bcad __ __ da __ __ cd
  3. In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below It. Choose the correct alternative

    _ a _ b _ abaa _ bab _ abb
  4. 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

  5. In the series _b_a_ba_b_abab_aab;

    fill in the six blanks ( _ ) using one of the following given four choices such that the series follows a specific order.

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