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Series Completion

Verbal Reasoning
1. 6, 13, 28, 59, ?
 
  • A. 111
  • B. 122
  • C. 126
  • D. 128
Ans: B.
Sol.
The pattern is × 2 + 1, × 2 + 2, × 2 + 3 +.....
So, missing term = 59 × 2 + 4 = 112.
 
2. 4, 12, 36, 108, ?
 
  • A. 124
  • B. 216
  • C. 304
  • D. 324
Ans: D.
Sol.
The pattern is × 3.
So, missing term = 108 × 3 = 324.
 
3. 1, 3, 4, 8, 15, 27, ?
 
  • A. 45
  • B. 50
  • C. 55
  • D. 60
Ans: B.
Sol.
The Sum of any three consecutive terms of the series given to the next term.
So, missing number = 8 + 15 + 27 = 50.
 
4. 3, 12, 27, 48, 75, 108, ?
 
  • A. 147
  • B. 157
  • C. 163
  • D. 182
Ans: A.
Sol.
The terms of the given series are 3 × 12, 3 × 22, 3 × 32, 3 × 42,
3 × 52, 3 × 62, .......
So, missing term = 3 × 72 = 3 × 49 = 147.
 
5. 28, 33, 31, 36, -----, 39?
 
  • A. 30
  • B. 32
  • C. 33
  • D. 34
Ans: D.
Sol.
The pattern is + 5, - 2, + 5, - 2, ....
So missing term = 36 - 2 = 34.