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Series Completion

21. 2, 2, 5, 13, 28, ?
 
  • A. 47
  • B. 49
  • C. 50
  • D. 52
Ans: D.
Sol.
The pattern is + 0, + 3, + 8, + 15, .....
i.e. + ( 12 - 1 ), + ( 22 - 1 ), + ( 32 - 1 ) + ( 42 - 1 ),...
So, missing term = 28 + ( 5 2 - 1) = 28 + 24 = 52.
 
 
22. 11, 13, 17, 19, 23, 25, ?
 
  • A. 25
  • B. 27
  • C. 29
  • D. 31
Ans: C.
Sol.
The pattern is + 2, + 4, + 2, + 4, .....
So, missing term = 25 + 4 = 29.
 
23. 66, 36, 18, ?
 
  • A. 3
  • B. 6
  • C. 7
  • D. 8
Ans: D.
Sol.
Each term in the series is the product of the digits of the preceding term.
So, missing term = 1 × 8 = 8.
 
24. 5, 2, 7, 9, 16, 25, ?
 
  • A. 41
  • B. 43
  • C. 45
  • D. 48
Ans: A.
Sol.
Each term in the series, except the first two terms, is the sum of the preceding two terms.
So, missing term = 16 + 25 = 41.
 
25. 563, 647, 479, 815, ?
 
  • A. 672
  • B. 386
  • C. 279
  • D. 143
Ans: D.
Sol.
The pattern is + 84, - 168, + 336,......
i.e. + 84, - ( 84 × 2), + ( 84 × 22), .....
So, missing term = 815 - ( 84 × 23) = 815 - 672 = 143.