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RRB ALP Series Questions with Answers & Explanations

20 Series questions from the Mental Ability & Reasoning section of RRB ALP, 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? B, F, J, N, ?

  1. AS
  2. BT
  3. CR
  4. DQ
Show answer
Answer: (C) R Each letter moves 4 places forward in the alphabet.
Question 2

What comes next in the series? 15, 31, 63, 127, 255, ?

  1. A511
  2. B514
  3. C516
  4. D505
Show answer
Answer: (A) 511 Each term is (previous × 2) + 1.
Question 3

What comes next in the series? 9, 11, 18, 20, 27, ?

  1. A31
  2. B28
  3. C29
  4. D26
Show answer
Answer: (C) 29 The differences alternate between +2 and +7.
Question 4

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

  1. AR
  2. BT
  3. CQ
  4. DS
Show answer
Answer: (A) R Each letter moves 4 places forward in the alphabet.
Question 5

What comes next in the series? 6, 13, 27, 55, 111, ?

  1. A229
  2. B223
  3. C222
  4. D213
Show answer
Answer: (B) 223 Each term is (previous × 2) + 1.
Question 6

What comes next in the series? 5, 9, 20, 24, 35, ?

  1. A45
  2. B39
  3. C33
  4. D36
Show answer
Answer: (B) 39 The differences alternate between +4 and +11.
Question 7

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

  1. AJ
  2. BL
  3. CI
  4. DK
Show answer
Answer: (A) J Each letter moves 2 places forward in the alphabet.
Question 8

What comes next in the series? 8, 15, 22, 29, 36, ?

  1. A44
  2. B48
  3. C42
  4. D43
Show answer
Answer: (D) 43 Each term increases by 7.
Question 9

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

  1. AS
  2. BP
  3. CQ
  4. DR
Show answer
Answer: (C) Q Each letter moves 2 places forward in the alphabet.
Question 10

What comes next in the series? 12, 13, 15, 18, 22, ?

  1. A32
  2. B27
  3. C33
  4. D22
Show answer
Answer: (B) 27 The differences increase by 1 each time.

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Question 11

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

  1. AN
  2. BO
  3. CL
  4. DM
Show answer
Answer: (D) M Each letter moves 2 places forward in the alphabet.
Question 12

What comes next in the series? 6, 12, 24, 48, 96, ?

  1. A202
  2. B195
  3. C192
  4. D186
Show answer
Answer: (C) 192 Each term is multiplied by 2.
Question 13

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

  1. AM
  2. BO
  3. CP
  4. DN
Show answer
Answer: (D) N Each letter moves 2 places forward in the alphabet.
Question 14

What comes next in the series? 12, 16, 20, 24, 28, ?

  1. A32
  2. B30
  3. C37
  4. D22
Show answer
Answer: (A) 32 Each term increases by 4.
Question 15

What comes next in the series? C, G, K, O, ?

  1. AT
  2. BR
  3. CU
  4. DS
Show answer
Answer: (D) S Each letter moves 4 places forward in the alphabet.
Question 16

What comes next in the series? 13, 27, 55, 111, 223, ?

  1. A449
  2. B453
  3. C457
  4. D447
Show answer
Answer: (D) 447 Each term is (previous × 2) + 1.
Question 17

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

  1. AK
  2. BJ
  3. CM
  4. DL
Show answer
Answer: (A) K Each letter moves 2 places forward in the alphabet.
Question 18

What comes next in the series? 7, 14, 28, 56, 112, ?

  1. A224
  2. B214
  3. C218
  4. D223
Show answer
Answer: (A) 224 Each term is multiplied by 2.
Question 19

What comes next in the series? 9, 19, 39, 79, 159, ?

  1. A318
  2. B319
  3. C320
  4. D329
Show answer
Answer: (B) 319 Each term is (previous × 2) + 1.
Question 20

What comes next in the series? I, M, Q, U, ?

  1. AZ
  2. BY
  3. CA
  4. DX
Show answer
Answer: (B) Y Each letter moves 4 places forward in the alphabet.

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

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