All Exams Test series for 1 year @ ₹349 only
Question

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

AC, CF, EJ, GO, ?

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

To solve the given problem, we need to determine the pattern in the series and find the correct term that should replace the question mark (?). The series given is: AC, CF, EJ, GO, ?

Let's first look at the pattern involving both letters in each term:

  1. First Position:
    • Identify the alphabetical positions: A=1, C=3, E=5, G=7.
    • The series of positions is: 1, 3, 5, 7.
    • Notice that these positions are increasing by 2. This suggests the next term should have the first letter corresponding to position 9, which is I.
  2. Second Position:
    • Identify the alphabetical positions: C=3, F=6, J=10, O=15.
    • The series of positions is: 3, 6, 10, 15.
    • The increments between these numbers are: 3, 4, 5. This shows a pattern of increasing by subsequent integers. Following this logic, the next increment should be 6, leading to the position 21. The letter corresponding to position 21 in the alphabet is U.

Therefore, the term that replaces the question mark (?) is IU. We can conclude that the correct answer is IU.

Was this answer helpful?

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.

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

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

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

    AZ, CX, GT, ?

  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.

Need Expert Advice?
Upcoming Exams
RRB Technician
October 06, 2026
RRB JE
October 27, 2026
RRB ALP
November 03, 2026
Test Series
RRB NTPC img
Railways
RRB NTPC Under Graduate 2026 New Mock Test Series
1580 Tests 2 Tests Free
544 Attempts
4.3(498)
English, Hindi, Telugu +7 More

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App