Quantitative Aptitude: Number Series 79

Directions(1-10): The following series are based on a certain pattern. One of the number in series is missing given by ?. Find that number.

  1. 71 , ? , 868, 4345, 26076
    800
    216
    642
    755
    None of these
    Option B
    71 *3 +3 =216
    216*4+4=868
    868*5+5=4345
    4345*6+6=26076

     

  2. 1, 8, 64, 512, ?,32768
    4444
    3999
    4425
    4096
    None of these
    Option D
    1*8=8
    8*8=64
    64*8=512
    512*8=4096
    4096*8=32,768

     

  3. 186, 115, 71, 44, 27, ?
    17
    10
    20
    11
    None of these
    Option A
    186 first term
    115 second term
    186-115=71
    71-44=27
    44-27=17

     

  4. 18.3, 20.6 , 16, 22.9 , 13.7, ?, 11.4
    22.2
    25.2
    20.4
    30.5
    None of these
    Option B
    18.3 + 2.3 = 20.6
    20.6 – 4.6 = 16
    16 + 6.9 = 22.9
    22.9 – 9.2 = 13.7
    13.7 +11.5 = 25.2
    25.2 – 13.8 = 11.4

     

  5. 5,25,7,?,9,19
    20
    15
    22
    18
    None of these
    Option C
    Add 2 and substract 3 alternatively. 5+2=7
    25-3=22
    7+2=9
    22-3= 19
    9+2=11

     

  6. 1000,1500,?,3375,5062.5,7593.75
    2155
    2100
    None of these
    2250
    2250
    Option E
    1000*3/2=1500
    1500*3/2=2250
    2250*3/2=3375
    3375*3/2=5062.5
    5062.5*3/2=7593.75

     

  7. 2,3,6,?,45,157.5
    15
    11
    20
    None of these
    9
    Option A
    2*1.5=3
    3*2=6
    6*2.5=15
    15*3=45
    45*3.5=157.5

     

  8. 5,11,23,47,?,191,383
    None of these
    95
    100
    88
    74
    Option B
    5*2+1=11
    11*2+1=23
    23*2+1=47
    47*2+1=95
    95*2+1=191
    191*2+1=383

     

  9. 4,5,13,40,104,?,445
    229
    198
    210
    None of these
    200
    Option A
    4+1^3=5
    5+2^3=13
    13+3^3=40
    40+4^3=104
    104+5^3=229
    229+6^3=445

     

  10. 47,?,49,55,67,87,117
    45
    47
    50
    None of these
    52
    Option B
    47+(0^2+0)=47
    47+(1^2+1)=49
    49+(2^2+2)=55
    55+(3^2+3)=67
    67+(4^2+4)=87
    87+(5^2+5)=117

     


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