Number Series


Direction: In the following number series only one is wrong. Find out the wrong number.

  1. 7, 4, 5, 9, 20, 51, 106.5











  1. View Hint View Answer Discuss in Forum

    The series is x 0.5 + 0.5, x 1 + 1, x 1.5 + 1.5. x 2 + 2, x 2.5 + 2.5, x 3 +3

    Correct Option: E

    The series is x 0.5 + 0.5, x 1 + 1, x 1.5 + 1.5. x 2 + 2, x 2.5 + 2.5, x 3 +3


  1. 18, 20, 23, 32, 48, 73, 109











  1. View Hint View Answer Discuss in Forum

    The series is 18 +12 = 19; 19 + 22 = 23; 23 + 32 = 32;
    32 + 42 = 48; 48 + 52 = 73 + 62 = 109

    Correct Option: A

    The series is 18 +12 = 19; 19 + 22 = 23; 23 + 32 = 32;
    32 + 42 = 48; 48 + 52 = 73 + 62 = 109



  1. 3, 7, 16, 35, 72, 153, 312











  1. View Hint View Answer Discuss in Forum

    The series is x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4, x 2 + 5

    Correct Option: D

    The series is x 2 + 1, x 2 + 2, x 2 + 3, x 2 + 4, x 2 + 5


  1. 2, 7, 30, 138, 524, 1557, 3102











  1. View Hint View Answer Discuss in Forum

    (2 - 1) x 7 = 7; (7 - 2) x 6 = 30; (30 - 3) x 5 = 135; (135 - 4) x 4 = 524;
    (524 - 5) x 3 = 1557; (1557 - 6) x 2 = 3102

    Correct Option: C

    (2 - 1) x 7 = 7; (7 - 2) x 6 = 30; (30 - 3) x 5 = 135; (135 - 4) x 4 = 524;
    (524 - 5) x 3 = 1557; (1557 - 6) x 2 = 3102



  1. 6, 10, 14, 34, 66, 130, 258











  1. View Hint View Answer Discuss in Forum

    The series is x 2 - 2, x 2 - 2, x 2 - 2, x 2 - 2, ......

    Correct Option: B

    The series is x 2 - 2, x 2 - 2, x 2 - 2, x 2 - 2, ......