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. 4
    2. 5
    3. 9
    4. 20
    5. 51

  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. 20
    2. 23
    3. 32
    4. 48
    5. 73

  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. 7
    2. 153
    3. 35
    4. 72
    5. 16

  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. 7
    2. 30
    3. 138
    4. 524
    5. 1557

  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. 10
    2. 14
    3. 34
    4. 66
    5. 130

  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, ......