Quantitative Aptitude : Number Series Set 84

Directions(1-5): Find the wrong number of the following number series.

  1. 7, 9, 16, 25, 41, 68, 107, 173
    07
    9
    7
    68
    173
    Option D
    16 = 9 + 7
    25 = 16 + 9
    41 = 25 + 16
    66 = 41 + 25
    68 is wrong and it should be replaced by 66.

     

  2. 16, 19, 21, 30, 46, 71, 107
    71
    21
    30
    107
    19
    Option E
    107 – 71 = 36 = 6^2
    71 – 46 = 25 = 5^2
    46 – 30 = 16 = 4^2
    30 – 21 = 9 = 3^2
    21 – 17 = 2^2
    19 is wrong and it should be replaced by 17.

     

  3. 4, 2, 3.5, 7.5, 26.25, 118.125
    7.5
    2
    3.5
    18.125
    4
    Option C
    *0.5
    *1.5
    *2.5
    *3.5
    *4.5
    3.5 is wrong and it should be replaced by 3.

     

  4. 16, 4, 2, 1.5, 1.75, 1.875
    1.875
    1.75
    16
    1.5
    2
    Option B
    *0.25
    *0.5
    *0.75
    *1
    *1.25
    1.75 is wrong and it should be replaced by 1.5.

     

  5. 2, 11, 38, 197, 1172, 8227, 65806
    11
    8227
    1172
    2
    38
    Option C
    11 = 2 × 3 + 5
    38 = 11 × 4 – 6
    197 = 38 × 5 + 7
    197 × 6 – 8
    1172 is wrong and it should be replaced by 197 × 6 – 8 = 1174.

     

  6. Directions(6-10): Find the missing term of the following series.

  7. 15, 12, 17, 10, ?, 8, 21, 6
    16
    19
    14
    13
    10
    Option B
    -3
    +5
    -7
    +9
    -11
    +13
    -15
    ? = 19

     

  8. 1, ?, 27, 64, 125
    11
    8
    10
    7
    9
    Option B
    1 = l^3
    ? = 2^3= 8
    27 = 3^3
    64 = 4^3
    125 = 5^3

     

  9. 2, 5, 7, 12, 19, 31, 50,?
    77
    62
    70
    81
    66
    Option D
    2 + 5 = 7
    7 + 5 = 12
    12 + 7 = 19
    19 + 12 = 31
    31 + 19 = 50
    50 + 31 = 81

     

  10. 4, 6, 12, 30, 90, 315, ?
    1100
    1120
    1260
    1352
    1450
    Option C
    *1.5
    *2
    *2.5
    *3
    *3.5
    *4
    ? = 1260

     

  11. 1, 6, 36, 240, 1960, ?
    18850
    17755
    18230
    19660
    17250
    Option D
    1 × 2 + 2 × 2 = 6
    6 × 4 + 4 × 3 = 36
    36 × 6 + 6 × 4 = 240
    240 × 8 + 8 × 5 = 1960
    1960 × 10 + 10 × 6 = 19660

     


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