Aptitude Questions: Number Series Set 17

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Find the wrong number in the following series

1. 16, 27, 44, 72, 96,131
   A.44
   B.72
   C.27
   D.96
   E.None of these
   
   Answer & Explanation

   Answer – B.72
   Explanation :
   16+11 = 27
   27+17 = 44….(11+6 = 17)
   44+23 = 67
   67+29 = 96
   96+35 = 131
   
   
   
2. 43 , 52, 34, 61, 89, 70
   A.89
   B.70
   C.52
   D.61
   E.None of these
   
   Answer & Explanation

   Answer – A.89
   Explanation :
   43+(9*1) = 43+9 = 52
   52-(9*2) = 52-18=34
   34+(9*3) = 34+27 = 61
   61-(9*4) = 61-36 = 25
   25+(9*5) = 25+45 = 70
   
   
   
3. 78,  38.5, 56.25, 138.125, 324.25
   A.56.25
   B.38.5
   C.138.125
   D.324.25
   E.None of these
   
   Answer & Explanation

   Answer – D.324.25
   Explanation :
   78*0.5-0.5 = 38.5
   38.5*1.5-1.5 = 56.25
   56.25*2.5-2.5 = 138.125
   138.125*3.5-3.5 = 479.94
   
   
   
4. 512, 514, 528, 556, 612
   A.556
   B.612
   C.514
   D.528
   E.None of these
   
   Answer & Explanation

   Answer – D.528
   Explanation :
   512 + 2 = 514
   514+12 = 526………(12-2 =10+8 = 18+12 =30)
   526+30 = 556……..(18+8 = 26+30 = 56)
   556+56 = 612 = 612
   
   
   
5. 157, 169.5, 194.5, 222, 282
   A.222
   B.282
   C.194.4
   D.169.5
   E.None of these
   
   Answer & Explanation

   Answer – A.222
   Explanation :
   157+12.5 = 169.5
   169.5+25 = 194.5
   194.5+37.5 = 232
   232+50 = 282
   
   
   
6. 213, 220, 337, 697, 1761.5
   A.337
   B.697
   C.1761.25
   D.220
   E.None of these
   
   Answer & Explanation

   Answer – A.337
   Explanation :
   213*1+7 = 220
   220*1.5+11 = 330+11 = 341
   341*2+15 = 682+15 = 697
   697*2.5+19 = 1742.5+19 = 1761.5
   
   
   
7. 3, 14, 23, 34, 47, 65
   A.23
   B.34
   C.47
   D.65
   E.None of these
   
   Answer & Explanation

   Answer – D.65
   Explanation :
   1*2+1 = 2+1 = 3
   3*4+2 = 12+2 = 14
   4*5+3 = 20+3 = 23
   5*6+4 = 30+4 = 34
   6*7+5 = 42+5 = 47
   7*8+6 = 56+6 = 62
   
   
   
8. 13, 29.5, 121.5, 732.5, 5863.5
   A.5863.5
   B.732.5
   C.121.5
   D.29.5
   E.None of these
   
   Answer & Explanation

   Answer – E.None of these
   Explanation :
   13*2+3.5 = 26+3.5 = 29.5
   29.5*4+3.5 = 118+3.5 = 121.5
   121.5*6+3.5 = 729+3.5 = 732.5
   732.5*8+3.5 = 5860+3.5 = 5863.5
   
   
   
9. 6, 12, 36, 96, 192, 384
   A.36
   B.96
   C.192
   D.384
   E.None of these
   
   Answer & Explanation

   Answer – A.36
   Explanation :
   6*2^0 = 6
   6*2^1 = 12
   6*2^3 = 48
   6*2^4 = 96
   6*2^5 = 192
   6*2^6 = 384
   
   
   
10. 72, 73.4, 144, 436.2, 1739.2, 8689
    A.144
    B.8689
    C.436.2
    D.11739.2
    E.None of these
    
    Answer & Explanation

    Answer – B.8689
    Explanation :
    72*1+1.4 = 73.4
    73.4*2-2.8 = 144
    144*3+4.2 = 436.2
    436.2*4-5.6 = 1739.2
    1739.2*5+7 = 8703
    
    
    

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