Aptitude Questions – Number Series Set 55

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1. 6,6, 9, ?, 90, 540                                                  
   A.22.5
   B.21
   C.23.2
   D.24.5
   E.None of these
   

   Answer & Explanation

   Answer – 1.22.5
   Explanation :
   6*1 = 6
   6*1.5 = 9
   9*2.5 = 22.5
   22.5*4 = 90
   90*6 = 540
   
   
   
2. 21, ?, 35, 57, 89, 131
   A.28
   B.21
   C.26
   D.23
   E.None of these
   

   Answer & Explanation

   Answer – 4.23
   Explanation :
   21+2 = 23
   23+12 =35
   35+22 = 57
   57+32 =89
   89+42 = 131
   
   
   
3. 3, 14, 39, 103, 270, ?
   A.606
   B.505
   C.707
   D.404
   E.None of these
   

   Answer & Explanation

   Answer – 3.707
   Explanation :
   3+11= 14
   14+(11+14 =25) =39
   39+(25+39 = 64) = 103
   103+(64+103 = 167) =270
   270+(167+270=437) =  707
   
   
   
4. 14, 18, ?, 458, 4458
   A.128
   B.58
   C.48
   D.44
   E.None of these
   

   Answer & Explanation

   Answer – 2.58
   Explanation :
   14+4 = 18
   18+40 = 58
   58+400 = 458
   458+4000 = 4458
   
   
   
5. 112, 113, 102, 213, ?
   A.899
   B.-988
   C.899
   D.-898
   E.None of these
   

   Answer & Explanation

   Answer – 4.-898
   Explanation :
   112+1 = 113
   113-11 = 102
   102+111 = 213
   213-1111 = -898
   
   
   
6. 221, 55, 224, 55, 236, ?, 257
   A.242
   B.55
   C.254
   D.57.25
   E.None of these
   

   Answer & Explanation

   Answer – 4.57.25
   Explanation :
   (221-1)/4 = 55
   (55+1)*4 = 224
   (224-4)/4 = 55
   (55+4)*4 = 236
   (236-7)/4 = 57.25
   (57.25+7)*4 = 257
   
   
   
7. 15, 80, 255, ?, 1295
   A.615
   B.625
   C.525
   D.624
   E.None of these
   

   Answer & Explanation

   Answer – 4.624
   Explanation :
   2^4 = 16-1 = 15
   3^4 = 81-1 = 80
   4^4 = 256-1 = 255
   5^4 = 625-1 = 624
   6^4 = 1296-1 = 1295
   
   
   
8. ?, 45, 90, 88, 176, 178, 356
   A.52
   B.39
   C.43
   D.65
   E.None of these
   

   Answer & Explanation

   Answer – 3.43
   Explanation :
   43+2 = 45
   45*2 = 90
   90-2 = 88
   88*2 = 176
   176+2 = 178
   178*2 = 356
   
   
   
9. 68, 80, 98, 122, ?, 188
   A.134
   B.152
   C.122
   D.148
   E.None of these
   

   Answer & Explanation

   Answer – 2.152
   Explanation :
   68+12+0 = 80
   80+12+6 =98
   98+12+12 = 122
   122+12+18 = 152
   152+12+24 = 188
   
   
   
10. 17, 10, 12, 20.5, ?
    A.44
    B.51
    C.37
    D.63
    E.None of these
    

    Answer & Explanation

    Answer – 1.44
    Explanation :
    17*0.5+1.5 = 10
    10*1+2 = 12
    12*1.5+2.5 = 20.5
    20.5*2+3 = 44