Series Completion problems
- 1. 120, 99, 80, 63, 48,?
Options- A. 35
- B. 38
- C. 39
- D. 40 Discuss
Correct Answer: 35
Explanation:
The pattern is - 21, - 19, - 17, - 15,.....
So, missing term = 48 - 13 = 35.
- 2. 589654237, 89654237, 8965423, 965423,?
Options- A. 58965
- B. 65423
- C. 89654
- D. 96542 Discuss
Correct Answer: 96542
Explanation:
The digits are removed one by one from the beginning and the end in order alternately
so as to obtain the subsequent terms of the series.
- 3. 3, 10, 101,?
Options- A. 10101
- B. 10201
- C. 10202
- D. 11012 Discuss
Correct Answer: 10202
Explanation:
Each term in the series is obtained by adding 1 to the square of the preceding term.
So, missing term = (101)2 + 1 = 10202.
- 4. In the series 2, 6, 18, 54, ...... what will be the 8th term?
Options- A. 4370
- B. 4374
- C. 7443
- D. 7434 Discuss
Correct Answer: 4374
Explanation:
Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,.....
So, the series is a G.P. in which a = 2, r = 3.
Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.
- 5. 125,80,45,20,?
Options- A. 5
- B. 8
- C. 10
- D. 12 Discuss
Correct Answer: 5
Explanation:
The pattern is - 45, - 35, - 25, .....
So, missing term = 20 - 15 = 5.
- 6. 1, 1, 4, 8, 9, 27, 16,?
Options- A. 32
- B. 64
- C. 81
- D. 256 Discuss
Correct Answer: 64
Explanation:
The series consists of squares and cubes of consecutive natural numbers i.e. 12, 13, 22, 23, 32, 33, 42, .....
So, missing term = 43 = 64.
- 7. 1, 2, 3, 6, 9, 18,?, 54
Options- A. 18
- B. 27
- C. 36
- D. 81 Discuss
Correct Answer: 27
Explanation:
The pattern is x 2, x 3/2, x 2, x 3/2, x 2,.....
So, missing term = 18 x 3/2 = 27.
- 8. 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.
- 9. 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.
- 10. 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.
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