Aptitude Questions: Number Series Set 24

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Questions Penned by Yogit

1. 15 30 52 83 125 178 ?
   a) 235
   b) 246
   c) 255
   d) 165
   e) None of these
   
   Answer & Explanation

   Answer – b) 246
   Explanation :
   15 + (4^2 – 1) = 30
   30 + (5^2 – 3) = 52
   52 + (6^2 – 5) = 83
   83 + (7^2 – 7) = 125
   125 + (8^2 – 11) = 178
   178 + (9^2 – 13) = 246
   
   
   
2. 10 20 20 60 90 360 ?
   a) 240
   b) 480
   c) 640
   d) 720
   e) None of these
   
   Answer & Explanation

   Answer – d) 720
   Explanation :
   10*2 = 20
   20*1 = 20
   20*3 = 60
   60*1.5 = 90
   90*4 = 360
   360*2 = 720
   
   
   
3. 50 26 14.5 9.25 7.125 ?
   a) 6.3625
   b) 6.5625
   c) 6.6625
   d) 7.6355
   e) None of these
   
   Answer & Explanation

   Answer – b) 6.5625
   Explanation :
   50*(1/2) + 1 = 26
   26*(1/2) + 1.5 = 14.5
   14.5*(1/2) + 2 = 9.25
   9.25*(1/2) + 2.5 = 7.125
   7.125*(1/2) + 3 = 6.5625
   
   
   
4. 10 49 243 1211 6047 ?
   a) 30219
   b) 21219
   c) 31219
   d) 28291
   e) None of these
   
   Answer & Explanation

   Answer – a) 30219
   Explanation :
   *5 -1, *5-2, *5 -4, *5 -8, *5 -16
   
   
   
5. 12 30 75 187.5 ? 1171.875
   a) 458.75
   b) 468.75
   c) 442.75
   d) 598.75
   e) None of these
   
   Answer & Explanation

   Answer – b) 468.75
   Explanation :
   multiply each term by 2.5
   
   
   
6. 32 160 1120 4480 ?
   a) 70670
   b) 60250
   c) 71680
   d) 89120
   e) None of these
   
   Answer & Explanation

   Answer – c) 71680
   Explanation :
   32*(3+2) = 160
   160*(1+6+0) = 1120
   1120*(1+1+2+0) = 4480
   4480*(4+4+8+0) = 71680
   
   
   
7. 64 66 72 88 128 ?
   a) 256
   b) 246
   c) 224
   d) 226
   e) None of these
   
   Answer & Explanation

   Answer – c) 224
   Explanation :
   64 + (1*2) = 66
   66 + (2*3) = 72
   72 + (4*4) = 88
   88 + (8*5) = 128
   128 + (16*6) = 224
   
   
   
8. 36 39 48 63 84 111 ?
   a) 141
   b) 142
   c) 143
   d) 144
   e) None of these
   
   Answer & Explanation

   Answer – d) 144
   Explanation :
   36 + 3*1 = 39
   39 + 3*3 = 48
   48 + 3*5 = 63
   63 + 3*7 = 84
   84 + 3*9 = 111
   111 + 3*11 = 144
   
   
   
9. 11, 15, 42, 58, 183, 219 ?
   a) 644
   b) 244
   c) 344
   d) 562
   e) None of these
   
   Answer & Explanation

   Answer – d) 562
   Explanation :
   11+2^2 = 15
   15+3^3 = 42
   42+4^2 = 58
   58+5^3 = 183
   183+6^2 = 219
   219+7^3 = 562
   
   
   
10. 2160 1082 543 273.5 ?
    a) 138.75
    b) 148.75
    c) 158.75
    d) 168.75
    e) None of these
    
    Answer & Explanation

    Answer – a) 138.75
    Explanation :
    2160/2 + 2 = 1082
    1082/2 + 4 = 545
    545/2 + 8 = 280.5
    280.5/2 + 16 = 156.25
    
    
    

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