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- Question
2, 3, 5,7,11,?, 17
Options- A. 12
- B. 13
- C. 14
- D. 15
- Correct Answer
- 13
ExplanationClearly, the given series consists of prime numbers starting from 2. So, the missingTags: AIEEE, Bank Exams, CAT, Bank Clerk, Bank POterm is the prime number after 11, which is 13.
Series Completion problems
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- 1. 198, 194, 185, 169,?
Options- A. 92
- B. 112
- C. 136
- D. 144 Discuss
Correct Answer: 144
Explanation:
The pattern is - 4, - 9, - 16,.....i.e. - 22, - 32, - 42,.....So, missing pattern = 169 - 52 = 169 - 25 = 144.
- 2. 3, 4, 7, 7, 13, 13, 21, 22, 31, 34,?
Options- A. 42
- B. 43
- C. 51
- D. 52 Discuss
Correct Answer: 43
Explanation:
The given sequence is a combination of two series :I. 3, 7, 13, 21, 31, ? and II. 4, 7, 13, 22, 34
The pattern in I is + 4, + 6, + 8, + 10,.....
The pattern in II is + 3, + 6, + 9, + 12,.....
So, missing term = 31 + 12 = 43.
- 3. 1, 3, 4, 8, 15, 27,?
Options- A. 37
- B. 44
- C. 50
- D. 55 Discuss
Correct Answer: 50
Explanation:
The sum of any three consecutive terms of the series gives the next term.So, missing number = 8 + 15 + 27 = 50.
- 4. 5,6,9, 15,?, 40
Options- A. 21
- B. 25
- C. 27
- D. 33 Discuss
Correct Answer: 25
Explanation:
The pattern is + 1, + 3, + 6,....., i.e. + 1, + (1, + 2), + (1 + 2 + 3),.....So, missing term = 15 + (1 + 2 + 3 + 4) = 25.
- 5. 6, 13, 25, 51, 101,?
Options- A. 201
- B. 202
- C. 203
- D. 205 Discuss
Correct Answer: 203
Explanation:
The pattern is x 2 + 1, x 2 - 1, x 2 + 1, x 2 - 1,.....So, missing term = 101 x 2 + 1 = 203.
- 6. 6, 12, 21,?, 48
Options- A. 33
- B. 38
- C. 40
- D. 45 Discuss
Correct Answer: 33
Explanation:
The pattern is + 6, + 9, + 12, + 15, .....So, missing term = 21 + 12 = 33.
- 7. Which term of the series 5, 10, 20, 40, ..... is 1280?
Options- A. 10th
- B. 9th
- C. 8th
- D. None of these Discuss
Correct Answer: 9th
Explanation:
Clearly, 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40,.....So, the series is a G.P. in which a = 5 and r = 2.
Let 1280 be the rath term of the series.
Then, 5x2n-1 = 1280 ⟺ 2n-1 = 256 = 28 ⟺ n - 1 = 8 ⟺ n = 9.
- 8. 2, 5, 9,?, 20, 27
Options- A. 14
- B. 16
- C. 18
- D. 24 Discuss
Correct Answer: 14
Explanation:
The pattern is + 3, + 4, + 5, + 6,.....So, missing term = 9 + 5 = 14.
- 9. 2, 3, 3, 5, 10, 13,?, 43, 172, 177
Options- A. 23
- B. 38
- C. 39
- D. 40 Discuss
Correct Answer: 39
Explanation:
The pattern is + 1, x 1, + 2, x 2, + 3, x 3, + 4, x 4, + 5.So, missing term = 13 x 3 = 39.
- 10. 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.
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