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AFCAT Series Questions with Answers & Explanations

20 Series questions from the Reasoning & Military Aptitude section of AFCAT, each with the correct answer and a worked explanation. Try each question first, then tap Show answer to check. When you're ready, take the timed chapter-wise test to see your all-India rank.

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Question 1

What comes next in the series? 6, 7, 9, 12, 16, ?

  1. A31
  2. B21
  3. C15
  4. D16
Show answer
Answer: (B) 21 The differences increase by 1 each time.
Question 2

What comes next in the series? A, D, G, J, ?

  1. AO
  2. BL
  3. CM
  4. DN
Show answer
Answer: (C) M Each letter moves 3 places forward in the alphabet.
Question 3

What comes next in the series? 36, 49, 64, 81, 100, ?

  1. A126
  2. B115
  3. C118
  4. D121
Show answer
Answer: (D) 121 The terms are consecutive perfect squares.
Question 4

What comes next in the series? E, G, I, K, ?

  1. AM
  2. BO
  3. CN
  4. DL
Show answer
Answer: (A) M Each letter moves 2 places forward in the alphabet.
Question 5

What comes next in the series? 13, 15, 26, 28, 39, ?

  1. A41
  2. B38
  3. C43
  4. D40
Show answer
Answer: (A) 41 The differences alternate between +2 and +11.
Question 6

What comes next in the series? B, F, J, N, ?

  1. AS
  2. BQ
  3. CT
  4. DR
Show answer
Answer: (D) R Each letter moves 4 places forward in the alphabet.
Question 7

What comes next in the series? 13, 22, 31, 40, 49, ?

  1. A64
  2. B58
  3. C55
  4. D61
Show answer
Answer: (B) 58 Each term increases by 9.
Question 8

What comes next in the series? H, J, L, N, ?

  1. AR
  2. BP
  3. CQ
  4. DO
Show answer
Answer: (B) P Each letter moves 2 places forward in the alphabet.
Question 9

What comes next in the series? 15, 16, 18, 21, 25, ?

  1. A25
  2. B40
  3. C30
  4. D32
Show answer
Answer: (C) 30 The differences increase by 1 each time.
Question 10

What comes next in the series? B, E, H, K, ?

  1. AP
  2. BN
  3. CO
  4. DM
Show answer
Answer: (B) N Each letter moves 3 places forward in the alphabet.

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Question 11

What comes next in the series? 9, 13, 21, 33, 49, ?

  1. A69
  2. B64
  3. C79
  4. D63
Show answer
Answer: (A) 69 The differences increase by 4 each time.
Question 12

What comes next in the series? H, L, P, T, ?

  1. AX
  2. BZ
  3. CW
  4. DY
Show answer
Answer: (A) X Each letter moves 4 places forward in the alphabet.
Question 13

What comes next in the series? 13, 25, 37, 49, 61, ?

  1. A78
  2. B68
  3. C79
  4. D73
Show answer
Answer: (D) 73 Each term increases by 12.
Question 14

What comes next in the series? A, D, G, J, ?

  1. AO
  2. BN
  3. CL
  4. DM
Show answer
Answer: (D) M Each letter moves 3 places forward in the alphabet.
Question 15

What comes next in the series? B, D, F, H, ?

  1. AJ
  2. BK
  3. CI
  4. DL
Show answer
Answer: (A) J Each letter moves 2 places forward in the alphabet.
Question 16

What comes next in the series? 11, 21, 31, 41, 51, ?

  1. A51
  2. B61
  3. C56
  4. D71
Show answer
Answer: (B) 61 Each term increases by 10.
Question 17

What comes next in the series? 3, 7, 11, 15, 19, ?

  1. A33
  2. B29
  3. C26
  4. D23
Show answer
Answer: (D) 23 Each term increases by 4.
Question 18

What comes next in the series? I, K, M, O, ?

  1. AR
  2. BP
  3. CQ
  4. DS
Show answer
Answer: (C) Q Each letter moves 2 places forward in the alphabet.
Question 19

What comes next in the series? 10, 30, 90, 270, 810, ?

  1. A2436
  2. B2430
  3. C2440
  4. D2431
Show answer
Answer: (B) 2430 Each term is multiplied by 3.
Question 20

What comes next in the series? H, L, P, T, ?

  1. AZ
  2. BW
  3. CX
  4. DY
Show answer
Answer: (C) X Each letter moves 4 places forward in the alphabet.

These are RankerClub practice questions written in the AFCAT pattern. They are not official SSC/IBPS/RRB papers.

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