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- Question
3, 15,?, 63, 99, 143
Options- A. 27
- B. 35
- C. 45
- D. 56
- Correct Answer
- 35
ExplanationThe terms of the given series are (22 - 1), (42 - 1),....., (82 - 1), (102 - 1), (122 - 1).So, missing term = (62 - 1) - (36 - 1) = 35.
Series Completion problems
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- 1. 22, 24, 28,?, 52, 84
Options- A. 36
- B. 38
- C. 42
- D. 46 Discuss
Correct Answer: 36
Explanation:
The pattern is + 2, + 4, + 8, + 16,.....So, missing term = 28 + 8 = 36.
- 2. 13, 32, 24, 43, 35,?, 46, 65, 57, 76
Options- A. 45
- B. 52
- C. 54
- D. 55 Discuss
Correct Answer: 54
Explanation:
The given sequence is a combination of two series:I. 13, 24, 35, 46, 57 and II. 32, 43, ?, 65, 76
The pattern in both I and II is + 11. So, missing term = 43 + 11 = 54.
- 3. Which of the following will not be a number of the series 1, 8, 27, 64, 125,.....?
Options- A. 256
- B. 512
- C. 729
- D. 1000 Discuss
Correct Answer: 256
Explanation:
The given series consists of cubes of natural numbers only. 256 is not the cube ofany natural number.
- 4. 2, 1, 2, 4, 4, 5, 6, 7, 8, 8, 10, 11,?
Options- A. 9
- B. 10
- C. 11
- D. 12 Discuss
Correct Answer: 10
Explanation:
The given sequence is a combination of three series :I. 1st, 4th, 7th, 10th, 13th terms i.e. 2, 4, 6, 8, ?
II. 2nd, 5th, 8th, 11th terms i.e. 1, 4, 7, 10
III. 3rd, 6th, 9th, 12th terms i.e. 2, 5, 8, 11
Clearly, I consists of consecutive even numbers. So, the missing term is 10.
- 5. 9, 27, 31, 155, 161, 1127,?
Options- A. 316
- B. 1135
- C. 1288
- D. 2254 Discuss
Correct Answer: 1135
Explanation:
The pattern is x 3, + 4, x 5, + 6, x 7,.....So, missing term = 1127 + 8 = 1135.
- 6. 90, 180, 12, 50, 100, 200,?, 3, 50, 4, 25, 2, 6, 30, 3
Options- A. 150
- B. 175
- C. 225
- D. 250 Discuss
Correct Answer: 150
Explanation:
Clearly, 90 = 30 x 3, 180 = 6 x 30, 12 = 2 x 6, 50 = 25 x 2, 100 = 4 x 25, 200 = 50 x 4.So, missing term = 3 x 50 = 150.
- 7. 48, 24, 96, 48, 192,?
Options- A. 76
- B. 90
- C. 96
- D. 98 Discuss
Correct Answer: 96
Explanation:
The pattern is ÷ 2, x 4, ÷ 2, x 4, .....So, missing term = 192 ÷ 2 = 96.
- 8. 2,15,41,80,?
Options- A. 111
- B. 120
- C. 121
- D. 132 Discuss
Correct Answer: 132
Explanation:
The pattern is + 13, + 26, + 39,.....So, missing term = 80 + 52 = 132.
- 9. 6, 11, 21, 36, 56,?
Options- A. 42
- B. 51
- C. 81
- D. 91 Discuss
Correct Answer: 81
Explanation:
The pattern is + 5, + 10, + 15, + 20, ...So, missing term = 56 + 25 = 81.
- 10. 563, 647, 479, 815,?
Options- A. 672
- B. 386
- C. 279
- D. 143 Discuss
Correct Answer: 143
Explanation:
The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 22), .....So, missing term = 815 - (84 x 23) = 815 - 672 = 143.
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