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Series Completion

16. 90, 180, 12, 50, 100, 200, ?, 3, 50, 4, 25, 2, 6, 30, 3
 
  • A. 125
  • B. 150
  • C. 175
  • D. 250
Ans: B.
Sol.
Clearly, 90 = 30 ×3, 180 = 6 × 30, 12 = 2 ×6, 50 = 25 ×2,
100 = 4 × 25, 200 = 50 × 4.
So, missing term = 3 × 50 = 150.
 
 
17. 5, 6, 9, 15, ?, 40
 
  • A. 21
  • B. 23
  • C. 25
  • D. 27
Ans: C.
Sol.
The pattern is + 1, + 3, + 6,.....
i.e. + 1, + (1, + 2), + ( 1 + 2 + 3),....
So missing term = 15 + ( 1 + 2 + 3 + 4 ) = 25.
 
18. 120, 99, 80, 63, 48, ?
 
  • A. 32
  • B. 35
  • C. 38
  • D. 39
Ans: B.
Sol.
The pattern is - 21, - 19, - 17, - 15,.......
So, missing term = 48 - 13 = 35.
 
19. 4, 10, ?, 82, 244, 730
 
  • A. 24
  • B. 28
  • C. 77
  • D. 218
Ans: B.
Sol.
Each number in the series is 2 less than thrice the preceding number.
So missing number = ( 10 × 3 ) - 2 = 28.
 
20. 1, 1, 2, 6, 24, ?, 720
 
  • A. 101
  • B. 106
  • C. 110
  • D. 120
Ans: D.
Sol.
The pattern is ×1, ×2, ×3, ×4,...
So, missing term = 24 × 5 = 120.