Quantitative Aptitude: Number Series Set 110

Directions(1-10): Find the missing term ‘?’ of the following number series.

  1. 11,6,7,12,?,67.5
    15
    20
    18
    22
    26
    Option E
    *0.5+0.5
    *1+1
    *1.5+1.5
    *2+2
    *2.5+2.5
    ? = 26

     

  2. 7,?,210,840,2520,5040
    38
    33
    42
    30
    48
    Option C
    *6,*5,*4,*3,*2
    ? = 42

     

  3. 5,18,?,83,135,200
    46
    39
    32
    34
    44
    Option E
    +13*1,+13*2,+13*3,+13*4,+13*5
    ? = 44

     

  4. 23,27,35,?,63,83
    40
    35
    30
    47
    45
    Option D
    +4,+8,+12,+16,+20
    ? = 47

     

  5. 254,126,62,?,14,6
    28
    25
    20
    30
    37
    Option D
    /2-1, /2-1, /2-1, /2-1, /2-1
    ? = 30

     

  6. 216,221,228,239,?,269
    225
    220
    252
    230
    215
    Option C
    +5,+7,+11,+13,+17
    ? = 252

     

  7. 125,124,?,111,95,70
    100
    120
    142
    135
    125
    Option B
    -1,-4,-9,-16,-25
    ? = 120

     

  8. 56,57,49,76,?,137
    14
    12
    20
    19
    16
    Option B
    +1^3,-2^3,+3^3,-4^3,+5^3
    ? = 12

     

  9. 5,17,31,47,65,?
    74
    80
    70
    85
    88
    Option D
    +12,+14,+16,+18,+20
    ? = 85

     

  10. 15,24,18,21,?,18
    21
    10
    13
    15
    27
    Option A
    Add 3 and Subtract 3 alternatively
    ? = 21

     


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