Series Completion Problems and Answers

• 22. Complete the series 2,2,5, 13,28,....

  1. 50
  2. 51
  3. 52
  4. 53

  Answer :

  Option C

  Explanation:

  \begin{aligned}
  \text{Pattern is }\\
  +1^2-1, +2^2-1, +3^2-1,+4^2-1 \\
  5^2-1 = 28 + 24 \\
  = 52
  \end{aligned}

• 23. Complete the series
  1,6,13,22,33,...

  1. 46
  2. 48
  3. 49
  4. 51

  Answer :

  Option A

  Explanation:

  Pattern is +5, +7, +9, +11
  So next number will be +13
  => 33+13 = 46

• 24. 5,9,17,29,45, ?

  1. 50
  2. 60
  3. 65
  4. 70

  Answer :

  Option C

  Explanation:

  In this series the pattern is +4, +8, +12, +16, so next will be +20
  
  Term which will replace the question mark in this series will be 45+20 = 65

• 25. 4, 10, (?), 82, 244, 730

  1. 26
  2. 28
  3. 40
  4. 48

  Answer :

  Option B

  Explanation:

  Each number in the series is the preceding number multiplied by 3 and then decreased by 2.

• 26. 11, 12, 17, 18, 23, 24, (....) . Which term will come next ?

  1. 27
  2. 29
  3. 31
  4. 33

  Answer :

  Option B

  Explanation:

  Please check, given sequence is combination of two seies
  [Note: Usually when terms are more than 5, then chances are there that it may contain 2 series.]
  
  Series 1 = 11, 17, 23
  Series 2 = 12, 18, 24
  
  So there is pattern +6 in each term
  Next term will be 23+6 = 29

• 27. 2,15,41,80, ? . Complete the series.

  1. 130
  2. 132
  3. 134
  4. 136

  Answer :

  Option B

  Explanation:

  Pattern is +13,+(13*2), +(13*3)
  Next will be +(13*4) = 80+52 = 132

• 28. 36, 34, 30, 28, 24, ... What number should come next?

  1. 22
  2. 20
  3. 18
  4. 16

  Answer :

  Option A

  Explanation:

  Pattern in the series is, -2, -4, -2, -4. So next term will be -2
  24 -2 = 22