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NIC UIIC AO Series Questions with Answers & Explanations

20 Series questions from the Reasoning Ability section of NIC UIIC AO, 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? 27, 64, 125, 216, 343, ?

  1. A510
  2. B512
  3. C511
  4. D506
  5. E514
Show answer
Answer: (B) 512 The terms are consecutive perfect cubes.
Question 2

What comes next in the series? 9, 15, 21, 27, 33, ?

  1. A38
  2. B37
  3. C29
  4. D39
  5. E42
Show answer
Answer: (D) 39 Each term increases by 6.
Question 3

What comes next in the series? 12, 25, 51, 103, 207, ?

  1. A405
  2. B421
  3. C414
  4. D415
  5. E413
Show answer
Answer: (D) 415 Each term is (previous × 2) + 1.
Question 4

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

  1. A319
  2. B321
  3. C318
  4. D309
  5. E313
Show answer
Answer: (A) 319 Each term is (previous × 2) + 1.
Question 5

What comes next in the series? 2, 5, 8, 11, 14, ?

  1. A17
  2. B16
  3. C23
  4. D22
  5. E19
Show answer
Answer: (A) 17 Each term increases by 3.
Question 6

What comes next in the series? 8, 17, 35, 71, 143, ?

  1. A289
  2. B288
  3. C297
  4. D287
  5. E290
Show answer
Answer: (D) 287 Each term is (previous × 2) + 1.
Question 7

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

  1. A37
  2. B45
  3. C44
  4. D39
  5. E42
Show answer
Answer: (E) 42 The differences alternate between +5 and +9.
Question 8

What comes next in the series? 9, 27, 81, 243, 729, ?

  1. A2187
  2. B2193
  3. C2186
  4. D2184
  5. E2185
Show answer
Answer: (A) 2187 Each term is multiplied by 3.
Question 9

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

  1. A1001
  2. B1003
  3. C990
  4. D1000
  5. E999
Show answer
Answer: (D) 1000 The terms are consecutive perfect cubes.
Question 10

What comes next in the series? 5, 11, 23, 47, 95, ?

  1. A192
  2. B190
  3. C197
  4. D191
  5. E201
Show answer
Answer: (D) 191 Each term is (previous × 2) + 1.

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Question 11

What comes next in the series? 5, 17, 29, 41, 53, ?

  1. A59
  2. B65
  3. C62
  4. D55
  5. E64
Show answer
Answer: (B) 65 Each term increases by 12.
Question 12

What comes next in the series? 8, 24, 72, 216, 648, ?

  1. A1934
  2. B1939
  3. C1954
  4. D1941
  5. E1944
Show answer
Answer: (E) 1944 Each term is multiplied by 3.
Question 13

What comes next in the series? 16, 25, 36, 49, 64, ?

  1. A83
  2. B75
  3. C81
  4. D79
  5. E71
Show answer
Answer: (C) 81 The terms are consecutive perfect squares.
Question 14

What comes next in the series? 14, 19, 31, 36, 48, ?

  1. A52
  2. B58
  3. C56
  4. D53
  5. E63
Show answer
Answer: (D) 53 The differences alternate between +5 and +12.
Question 15

What comes next in the series? 1, 8, 27, 64, 125, ?

  1. A226
  2. B210
  3. C214
  4. D213
  5. E216
Show answer
Answer: (E) 216 The terms are consecutive perfect cubes.
Question 16

What comes next in the series? 9, 15, 26, 32, 43, ?

  1. A59
  2. B50
  3. C49
  4. D43
  5. E54
Show answer
Answer: (C) 49 The differences alternate between +6 and +11.
Question 17

What comes next in the series? 2, 5, 11, 23, 47, ?

  1. A90
  2. B95
  3. C94
  4. D100
  5. E105
Show answer
Answer: (B) 95 Each term is (previous × 2) + 1.
Question 18

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

  1. A123
  2. B122
  3. C126
  4. D121
  5. E124
Show answer
Answer: (D) 121 The terms are consecutive perfect squares.
Question 19

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

  1. A729
  2. B732
  3. C735
  4. D731
  5. E728
Show answer
Answer: (A) 729 The terms are consecutive perfect cubes.
Question 20

What comes next in the series? 9, 13, 17, 21, 25, ?

  1. A27
  2. B39
  3. C31
  4. D35
  5. E29
Show answer
Answer: (E) 29 Each term increases by 4.

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

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