Quantitative Aptitude: Number Series Set 98

Directions(1-5): Find the missing term ‘?’ of the following series.

  1. 81, 82, 42, 15, ?
    3.33
    2.50
    4.75
    6.16
    2.87
    Option C
    Pattern is 81+1/ 1 , 82+2 /2 , 42+3/ 3 , 15+4/ 4 = 4.75

     

  2. 8, 7, 11, 12, 14, 17, 17, 22, ?
    12
    18
    22
    20
    15
    Option D
    Two series are there. I.e. (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5
    ? = 20

     

  3. 1, 5, 14, 30, 55, 91, ?
    124
    138
    140
    156
    178
    Option C
    Pattern is +2 ^2 , +3 ^2 , +4^ 2 , +5^ 2 … ….
    ? = 91 + 7^2 = 140

     

  4. 11, 29, 83, 245, 731, ?
    1881
    2020
    1562
    1992
    2189
    Option E
    Series is × 3 − 4
    ? = 731 × 3 − 4 = 2189

     

  5. 4, 1, 0.5, 0.5, 1, ?
    9
    4
    5
    8
    6
    Option B
    Series is ×0.25, ×0.5, ×1, ×2, ×4
    ? = 4

     

  6. 6, 9, 18, 45, 126, ?
    313
    369
    350
    320
    309
    Option B
    Series is +3^ 1 , +3^ 2 , +3^ 3 , +3 ^4 , +3 ^5
    ? = 126 + 243 = 369

     

  7. 3, 8, 20, 46, 100, 210, ?
    389
    400
    356
    432
    411
    Option D
    Series is as × 2 + 2,× 2 + 4,× 2 + 6,× 2 + 8,× 2 + 10,× 2 + 12
    ? = 210 × 2 + 12 = 432

     

  8. 2, 4.5, 9.5, 19.5, 39.5, ?
    81.8
    67.7
    55.5
    79.5
    67.1
    Option D
    Series is +2.5, +5, +10, +20, +40
    ? = 39.5 + 40 = 79.5

     

  9. 5, 7, 17, 55, 225, 1131, ?
    6617
    5647
    6793
    9927
    8163
    Option C
    Series is as, × 1 + 2,× 2 + 3,× 3 + 4,× 4 + 5,× 5 + 6,× 6 + 7
    ? = 1131 × 6 + 7 = 6793

     

  10. 677, 785, 901, 1025, ? , 1297
    1245
    1728
    1452
    1157
    1900
    Option D
    26² + 1 = 677
    28² + 1 = 785
    30² + 1 = 901
    32² + 1 = 1025
    34² + 1 = 1157
    36² + 1 = 1297
    ? = 1157

     


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