Sequences and Series


  1. 2, 15, 41, 80,132, ?









  1. View Hint View Answer Discuss in Forum

    Series pattern
    + 13, + 26, + 39, + 52, + 65

    Correct Option: A

    Series pattern
    + 13, + 26, + 39, + 52, + 65
    ∴ Missing term = 132 + 65 = 197


Direction: What should come in place of the question mark in each of the following number series ?

  1. 12, 15, 36, ?, 480, 2415, 14508









  1. View Hint View Answer Discuss in Forum

    Series pattern
    12 x 1 + 3 x 1 = 15
    15 x 2 + 3 x 2 = 36
    36 x 3 + 3 x 3 = 117
    Should come in place of ?
    117 x 4 + 3 x 4 = 480

    Correct Option: C

    Series pattern
    12 x 1 + 3 x 1 = 15
    15 x 2 + 3 x 2 = 36
    36 x 3 + 3 x 3 = 117
    Should come in place of ?
    117 x 4 + 3 x 4 = 480
    480 x 5 + 3 x 5 = 2415
    2415 x 6 + 3 x 6 =14508



  1. 1220, 244, ....., 9.76, 1.952, ?









  1. View Hint View Answer Discuss in Forum

    Series pattern
    Previous number / 5

    Correct Option: A

    Series pattern
    Previous number/5
    ∴ Missing term = 244/5 = 48.8


  1. What is the 507th term of the sequence 1, –1, 2, –2, 1, –1, 2, – 2, 1, ....?









  1. View Hint View Answer Discuss in Forum

    On the basis of above given series ,
    Clearly, repetition takes place for each set of four terms.
    Hence, 507th term will be 2507, when divided by 4, gives 3 as remainder and 3rd term is 2.

    Correct Option: D

    On the basis of above given series ,
    Clearly, repetition takes place for each set of four terms.
    Hence, 507th term will be 2507, when divided by 4, gives 3 as remainder and 3rd term is 2. Thus , option D is correct answer.



  1. 1, 9, 25, 49, 81, ?









  1. View Hint View Answer Discuss in Forum

    12, 32, 52, 72, 92, 112

    Correct Option: A

    Series pattern
    12, 32, 52, 72, 92, 112
    So missing term = 112 = 121