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- Question
1, 3, 10, 21, 64, 129, 356, 777
Options- A. 21
- B. 129
- C. 10
- D. 356
- Correct Answer
- 356
ExplanationThe correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,.....So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.
Series Completion problems
Search Results
- 1. 25, 36, 49, 81, 121, 169, 225
Options- A. 36
- B. 49
- C. 169
- D. 225 Discuss
Correct Answer: 36
Explanation:
The correct sequence is 52, 72, 92, 112, 132, 152. So, 36 is wrong.- 2. 1, 5, 5, 9, 7, 11, 11, 15, 12, 17
Options- A. 11
- B. 12
- C. 17
- D. 15 Discuss
Correct Answer: 12
Explanation:
The given sequence is a combination of two series:I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.
- 3. 56, 58, 62, 70, 84, 118, 182
Options- A. 58
- B. 62
- C. 84
- D. 118 Discuss
Correct Answer: 84
Explanation:
The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 22, + 23, + 24, + 25, + 26.So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.
- 4. 196, 169, 144, 121, 101
Options- A. 101
- B. 121
- C. 169
- D. 196 Discuss
Correct Answer: 101
Explanation:
The sequence is (14)2, (13)2, (12)2, (11)2, (10)2.So, 101 is wrong and must be replaced by (10)2 i.e. 100.
- 5. 3, 2, 8, 9, 13, 22, 18, 32, 23, 42
Options- A. 8
- B. 9
- C. 13
- D. 22 Discuss
Correct Answer: 9
Explanation:
The given sequence is a combination of two series:I. 3, 8, 13, 18, 23 and II. 2, 9, 22, 32, 42
The pattern in I is + 5, and the pattern in II is + 10. So, in II, 9 is wrong and must be replaced by (2 + 10) i.e. 12.
- 6. 5, 10, 40, 80, 320, 550, 2560
Options- A. 80
- B. 320
- C. 550
- D. 2560 Discuss
Correct Answer: 550
Explanation:
The correct pattern is x 2, x 4, x 2, x 4, .....So, 550 is wrong and must be replaced by (320 x 2) i.e. 640.
- 7. 2, 3, 4, 4, 6, 8, 9, 12, 16
Options- A. 3
- B. 6
- C. 9
- D. 12 Discuss
Correct Answer: 9
Explanation:
The given sequence is a combination of three series:I. 1st, 4th, 7th terms i.e. 2, 4, 9,.....
II. 2nd, 5th, 8th terms i.e. 3, 6, 12,.....
III. 3rd, 6th, 9th terms i.e. 4, 8, 16,.....
In each one of I, II and III, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4 x 2) i.e. 8.
- 8. 11, 5, 20, 12, 40, 26, 74, 54
Options- A. 5
- B. 20
- C. 40
- D. 26 Discuss
Correct Answer: 40
Explanation:
The given sequence is a combination of two series :I. 11, 20, 40, 74 and II. 5, 12, 26, 54
The correct pattern in I is + 9, + 18, + 36,.....
So, 40 is wrong and must be replaced by (20 + 18) i.e. 38.
- 9. 5, 27, 61, 122, 213, 340, 509
Options- A. 27
- B. 61
- C. 122
- D. 509 Discuss
Correct Answer: 27
Explanation:
The terms of the series are (23 - 3), (33 - 3), (43 - 3), (53 - 3), (63 - 3), (73 - 3),(83-3).
So, 27 is wrong and must be replaced (33 - 3) i.e. 24.
- 10. 3, 7, 15, 39, 63, 127, 255, 511
Options- A. 15
- B. 39
- C. 63
- D. 127 Discuss
Correct Answer: 39
Explanation:
The correct pattern is x 2 + 1.So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.
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