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- Question
5, 27, 61, 122, 213, 340, 509
Options- A. 27
- B. 61
- C. 122
- D. 509
- Correct Answer
- 27
ExplanationThe 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.
Series Completion problems
Search Results
- 1. 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.
- 2. 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.
- 3. 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.
- 4. 1, 3, 10, 21, 64, 129, 356, 777
Options- A. 21
- B. 129
- C. 10
- D. 356 Discuss
Correct Answer: 356
Explanation:
The 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.
- 5. 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.- 6. 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.
- 7. 380, 188, 92, 48, 20, 8, 2
Options- A. 8
- B. 20
- C. 48
- D. 188 Discuss
Correct Answer: 48
Explanation:
The correct pattern is - 192, - 96, - 48, - 24, - 12, - 6.So, 48 is wrong and must be replaced by (92 - 48) i.e. 44.
- 8. 16, 22, 30, 45, 52, 66
Options- A. 30
- B. 45
- C. 52
- D. 66 Discuss
Correct Answer: 45
Explanation:
The correct pattern is + 6, + 8, + 10, + 12, + 14.So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.
- 9. 10, 26, 74, 218, 654, 1946, 5834
Options- A. 26
- B. 74
- C. 218
- D. 654 Discuss
Correct Answer: 654
Explanation:
The correct pattern is x 3 - 4.So, 654 is wrong and must be replaced by (218 x 3 - 4) i.e. 650.
- 10. 24576, 6144, 1536, 386, 96, 24
Options- A. 96
- B. 386
- C. 1536
- D. 6144 Discuss
Correct Answer: 386
Explanation:
Each term of the series is obtained by dividing the preceding term by 4.So, 1536 is wrong and must be replaced by (1536 + 4) i.e. 384.
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