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Series Completion Questions Answers

  • 29. 6, 11, 21, 36, 56, ... ?

    1. 81
    2. 83
    3. 95
    4. 105
    Answer And Explanation

    Answer: Option A

    Explanation:

    Pattern is +5, +10, +15, + 20. So next will be 56+25 = 81

  • 30. 5, 9, 17, 29, 45, ... ?

    1. 58
    2. 64
    3. 65
    4. 80
    Answer And Explanation

    Answer: Option C

    Explanation:

    Pattern in the series is +4, +8, +12, +16.
    Next term will be 45 + 20 = 65

  • 31. 20, 19, 17, (...) , 10, 5

    1. 16
    2. 12
    3. 15
    4. 14
    Answer And Explanation

    Answer: Option D

    Explanation:

    Pattern in the series is -1, -2, .., .. , -5

    So next term will be 17 - 3 = 14

  • 32. 13, 35, 57, 79, 911, ?

    1. 1005
    2. 1110
    3. 1113
    4. 1140
    Answer And Explanation

    Answer: Option C

    Explanation:

    The terms of the given series are numbers formed by joining together consecutive odd 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.

  • 33. 4, 10, (?), 82, 244, 730

    1. 26
    2. 28
    3. 40
    4. 48
    Answer And Explanation

    Answer: Option B

    Explanation:

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

  • 34. In the series 3, 9, 15.. what will be the 21st term ?

    1. 123
    2. 126
    3. 129
    4. 136
    Answer And Explanation

    Answer: Option A

    Explanation:

    We can judge that it is A.P.
    With 6 as difference
    nth term in A.P. = a+(n-1)d
    a= 3, n = 21, d = 6
    So, 21st term will be = 3+(20)6 = 123

  • 35. In the series 2, 6, 18, 54, ... what will be the 8th term ?

    1. 4174
    2. 4150
    3. 4274
    4. 4374
    Answer And Explanation

    Answer: Option D

    Explanation:

    We can see the given series is in G.P.
    as 2*3 = 6, 6*3 = 18, 18*3 = 54
    So a = 2 , r = 3
    nth term in G.P. is
    \begin{aligned}
    ar^{n-1} \\
    = 2*3{8-1} \\
    = 2*3^7 \\
    = 2*2187 = 4374
    \end{aligned}