Series Completion problems
- 1. 66, 36, 18,?
Options- A. 3
- B. 6
- C. 8
- D. 9 Discuss
Correct Answer: 8
Explanation:
Each term in the series is the product of the digits of the preceding term.
So, missing term = 1 x 8 = 8.
- 2. In the series 3, 9, 15, ...... what will be the 21st term?
Options- A. 117
- B. 121
- C. 123
- D. 129 Discuss
Correct Answer: 123
Explanation:
Clearly, 3 + 6 = 9, 9 + 6 = 15,.....
So, the series is an A.P. in which a = 3 and d = 6.
Therefore 21st term = a + (21 - 1) d = a + 20d = 3 + 20 x 6 = 123.
- 3. 28, 33, 31, 36,?, 39
Options- A. 32
- B. 34
- C. 38
- D. 40 Discuss
Correct Answer: 34
Explanation:
The pattern is + 5, - 2, + 5, - 2,.....
So, missing term = 36 - 2 = 34.
- 4. 1, 9, 25, 49, 81,?
Options- A. 100
- B. 112
- C. 121
- D. 144 Discuss
Correct Answer: 121
Explanation:
The series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72, 92,.....
So, missing term = 112 = 121.
- 5. 1, 9, 25, 49,?, 121
Options- A. 64
- B. 81
- C. 91
- D. 100 Discuss
Correct Answer: 81
Explanation:
The given series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72,.....
So, missing term = 92 = 81.
- 6. 2,2,5, 13,28,?
Options- A. 49
- B. 50
- C. 51
- D. 52 Discuss
Correct Answer: 52
Explanation:
The pattern is + 0, + 3, + 8, + 15, ..... i.e. + (l2 - 1), + (22 - 1), + (32 - 1), + (42 - 1), .....
So, missing term = 28 + (52 - 1) = 28 + 24 = 52.
- 7. 0, 2, 8, 14,?, 34
Options- A. 20
- B. 23
- C. 24.
- D. 25 Discuss
Correct Answer: 24.
Explanation:
The pattern is + 2, + 6, + 6, + 10, + 10,.....
So, missing term = 14 + 10 = 24.
- 8. 1, 5, 14, 30, 55, 91,?
Options- A. 130
- B. 140
- C. 150
- D. 160 Discuss
Correct Answer: 140
Explanation:
The pattern is + 4, + 9, + 16, + 25, + 36, ..... i.e. + 22, + 32, + 42, + 52, + 62,.....
So, missing term = 91 + 72 = 91 + 49 = 140.
- 9. In the series 10, 17, 24, 31, 38,.....which of the following will be a number of the series?
Options- A. 48
- B. 346
- C. 574
- D. 1003 Discuss
Correct Answer: 346
Explanation:
The given series consists of numbers each of which, on dividing by 7, leaves a
remainder 3. No other number except 346 satisfies the property.
- 10. 240,?, 120, 40, 10, 2
Options- A. 180
- B. 240
- C. 420
- D. 480 Discuss
Correct Answer: 240
Explanation:
The pattern is ÷ 1, ÷ 2, ÷ 3, ÷ 4, ÷ 5.
So, missing term = 240 ÷ 1 = 240.
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