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Home ‣ Verbal Reasoning ‣ Series Completion Comments
- Question
3, 7, 15,?, 63, 127
Options- A. 30
- B. 31
- C. 47
- D. 52
- Correct Answer
- 31
ExplanationEach number in the series is one more than twice the preceding number.So, missing term = (15 x 2) + 1 = 31.
Series Completion problems
Search Results
- 1. 8, 9, 8, 7, 10, 9, 6, 11, 10,?, 12
Options- A. 5
- B. 7
- C. 8
- D. 11 Discuss
Correct Answer: 5
Explanation:
The given sequence is a combination of three series :I. 1st, 4th, 7th, 10th terms i.e. 8, 7, 6, ?
II. 2nd, 5th, 8th, 11th terms i.e. 9, 10, 11, 12
III. 3rd, 6th, 9th terms i.e. 8, 9, 10 The pattern in I is - 1.
So, missing term = 6 - 1 = 5.
- 2. Which term of the series 5, 8, 11, 14,.....is 320?
Options- A. 104th
- B. 105th
- C. 106th
- D. 64th Discuss
Correct Answer: 106th
Explanation:
Clearly, 5 + 3 = 8, 8 + 3 = 11, 11 + 3 = 14, .....So, the series is an A.P. in which a - 5 and d = 3.
Let 320 be the nth term of the series.
Then, 320 = 5 + (n - 1) x 3 or (n - 1) = 105 or n = 106.
- 3. 4, 12, 36, 108,?
Options- A. 144
- B. 216
- C. 304
- D. 324 Discuss
Correct Answer: 324
Explanation:
The pattern is x 3.So, missing term = 108 x 3 = 324.
- 4. 6, 13,28,59,?
Options- A. 111
- B. 113
- C. 114
- D. 122 Discuss
Correct Answer: 122
Explanation:
The pattern is x 2 + 1, x 2 + 2, x 2 + 3,.....So, missing term = 59 x 2 + 4 = 122.
- 5. 4, 9, 25,?, 121, 169, 289, 361
Options- A. 49
- B. 64
- C. 81
- D. 87 Discuss
Correct Answer: 49
Explanation:
The given series consists of squares of consecutive prime numbersi.e. 22, 32, 52,.....,
112, 132, 172, 192.
So, missing term = 72 = 49.
- 6. 4, 10,?, 82, 244, 730
Options- A. 24
- B. 28
- C. 77
- D. 218 Discuss
Correct Answer: 28
Explanation:
Each number in the series is 2 less than thrice the preceding number.So, missing number = (10 x 3) - 2 = 28.
- 7. 1, 5, 13,25,41,?
Options- A. 51
- B. 57
- C. 61
- D. 63 Discuss
Correct Answer: 61
Explanation:
The pattern is + 4, + 8, + 12, + 16......So, missing term = 41 + 20 = 61.
- 8. 325, 259, 204, 160, 127, 105,?
Options- A. 94
- B. 96
- C. 98
- D. 100 Discuss
Correct Answer: 94
Explanation:
The pattern is - 66, - 55, - 44, - 33, - 22, .....So, missing term = 105 - 11 = 94.
- 9. 4, 7, 12, 19, 28,?
Options- A. 30
- B. 36
- C. 39
- D. 49 Discuss
Correct Answer: 39
Explanation:
The pattern is + 3, + 5, + 7, + 9, .....So, missing term = 28 + 11 = 39.
- 10. 5760, 960,?, 48, 16, 8
Options- A. 120
- B. 160
- C. 192
- D. 240 Discuss
Correct Answer: 192
Explanation:
The pattern is ÷ 6, ÷ 5, ÷ 4, ÷ 3, ÷ 2.So, missing term = 960 - 5 = 192.
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