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- Question
In the series 3, 9, 15, ...... what will be the 21st term?
Options- A. 117
- B. 121
- C. 123
- D. 129
- Correct Answer
- 123
ExplanationClearly, 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.
Series Completion problems
Search Results
- 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. 1, 4, 10, 22, 46,?
Options- A. 64
- B. 86
- C. 94
- D. 122 Discuss
Correct Answer: 94
Explanation:
The pattern is + 3, + 6, + 12, + 24,.....So, missing term = 46 + 48 = 94.
- 3. 13, 35, 57, 79, 911,?
Options- A. 1110
- B. 1112
- C. 1113
- D. 1315 Discuss
Correct Answer: 1113
Explanation:
The terms of the given series are numbers formed by joining together consecutiveodd numbers in order i.e. 1 and 3, 3 and 5, 5 and 7, 7 and 9, 9 and 11, .....
So, missing term = number formed by joining 11 and 13 = 1113.
- 4. 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.
- 5. 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.
- 6. 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.
- 7. 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 numbersi.e. 12, 32, 52, 72, 92,.....
So, missing term = 112 = 121.
- 8. 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 numbersi.e. 12, 32, 52, 72,.....
So, missing term = 92 = 81.
- 9. 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.
- 10. 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.
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