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IBPS RRB PO Series Questions with Answers & Explanations

20 Series questions from the Reasoning section of IBPS RRB PO, 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? 10, 22, 34, 46, 58, ?

  1. A60
  2. B64
  3. C70
  4. D76
  5. E69
Show answer
Answer: (C) 70 Each term increases by 12.
Question 2

What comes next in the series? 125, 216, 343, 512, 729, ?

  1. A1005
  2. B997
  3. C1000
  4. D998
  5. E1001
Show answer
Answer: (C) 1000 The terms are consecutive perfect cubes.
Question 3

What comes next in the series? 2, 8, 14, 20, 26, ?

  1. A33
  2. B32
  3. C35
  4. D27
  5. E26
Show answer
Answer: (B) 32 Each term increases by 6.
Question 4

What comes next in the series? 5, 9, 16, 20, 27, ?

  1. A25
  2. B31
  3. C32
  4. D26
  5. E29
Show answer
Answer: (B) 31 The differences alternate between +4 and +7.
Question 5

What comes next in the series? 6, 18, 54, 162, 486, ?

  1. A1458
  2. B1468
  3. C1459
  4. D1455
  5. E1456
Show answer
Answer: (A) 1458 Each term is multiplied by 3.
Question 6

What comes next in the series? 14, 42, 126, 378, 1134, ?

  1. A3392
  2. B3397
  3. C3396
  4. D3407
  5. E3402
Show answer
Answer: (E) 3402 Each term is multiplied by 3.
Question 7

What comes next in the series? 2, 4, 8, 14, 22, ?

  1. A26
  2. B27
  3. C32
  4. D42
  5. E31
Show answer
Answer: (C) 32 The differences increase by 2 each time.
Question 8

What comes next in the series? 125, 216, 343, 512, 729, ?

  1. A990
  2. B1005
  3. C997
  4. D1010
  5. E1000
Show answer
Answer: (E) 1000 The terms are consecutive perfect cubes.
Question 9

What comes next in the series? 15, 20, 25, 30, 35, ?

  1. A30
  2. B40
  3. C50
  4. D45
  5. E39
Show answer
Answer: (B) 40 Each term increases by 5.
Question 10

What comes next in the series? 64, 125, 216, 343, 512, ?

  1. A735
  2. B727
  3. C719
  4. D729
  5. E723
Show answer
Answer: (D) 729 The terms are consecutive perfect cubes.

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Question 11

What comes next in the series? 8, 27, 64, 125, 216, ?

  1. A353
  2. B341
  3. C344
  4. D343
  5. E338
Show answer
Answer: (D) 343 The terms are consecutive perfect cubes.
Question 12

What comes next in the series? 49, 64, 81, 100, 121, ?

  1. A154
  2. B141
  3. C134
  4. D150
  5. E144
Show answer
Answer: (E) 144 The terms are consecutive perfect squares.
Question 13

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

  1. A224
  2. B221
  3. C218
  4. D219
  5. E225
Show answer
Answer: (A) 224 Each term is multiplied by 2.
Question 14

What comes next in the series? 14, 24, 34, 44, 54, ?

  1. A62
  2. B64
  3. C58
  4. D63
  5. E69
Show answer
Answer: (B) 64 Each term increases by 10.
Question 15

What comes next in the series? 2, 3, 5, 8, 12, ?

  1. A12
  2. B23
  3. C17
  4. D19
  5. E11
Show answer
Answer: (C) 17 The differences increase by 1 each time.
Question 16

What comes next in the series? 4, 8, 17, 21, 30, ?

  1. A35
  2. B31
  3. C24
  4. D34
  5. E33
Show answer
Answer: (D) 34 The differences alternate between +4 and +9.
Question 17

What comes next in the series? 9, 14, 23, 28, 37, ?

  1. A39
  2. B32
  3. C42
  4. D37
  5. E43
Show answer
Answer: (C) 42 The differences alternate between +5 and +9.
Question 18

What comes next in the series? 15, 18, 24, 33, 45, ?

  1. A60
  2. B58
  3. C54
  4. D65
  5. E62
Show answer
Answer: (A) 60 The differences increase by 3 each time.
Question 19

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

  1. A449
  2. B447
  3. C448
  4. D441
  5. E452
Show answer
Answer: (B) 447 Each term is (previous × 2) + 1.
Question 20

What comes next in the series? 5, 9, 21, 25, 37, ?

  1. A31
  2. B36
  3. C46
  4. D38
  5. E41
Show answer
Answer: (E) 41 The differences alternate between +4 and +12.

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

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