Aptitude Questions: Number Series Set 19

Hello Aspirants. Welcome to Online Quantitative Aptitude Section in AffairsCloud.com. Here we are creating question sample in Number Series, which is common for all the competitive exams. We have included Some questions that are repeatedly asked in bank exams !!!

In each of the following number series, a wrong number is given. Find out that number.

1. 1, 11, 38, 78, 175, 301
   A.11
   B.78
   C.175
   D.301
   E.None of these
   
   Answer & Explanation

   Answer – B.78
   Explanation :
   1+3^2+1 = 11
   11+5^2+2 = 38
   38+7^2+3 = 90
   90+9^2+4 = 175
   175+11^2+5 = 301
   
   
   
2. 7, 39, 85, 179, 211, 369, 879
   A.369
   B.211
   C.179
   D.879
   E.None of these
   
   Answer & Explanation

   Answer – D.879
   Explanation :
   7*2+3 = 17
   17*2+5 = 39
   39*2+7 = 85
   85*2+9 = 179
   179*2+11 = 369
   369*2+13 = 751
   
   
   
3. 5, 8.5, 54.5, 90.25, 250.25, 125.125
   A.90.25
   B.8.5
   C.250.25
   D.125.125
   E.None of these
   
   Answer & Explanation

   Answer – A.90.25
   Explanation :
   5*0.5 = 2.5+6 = 8.5
   8.5*5 = 42.5+12 = 54.5
   54.5*0.5 = 27.25+18 = 45.25
   45.25*5 =226.25+24 = 250.25
   250.25*0.5 = 125.125
   
   
   
4. 65, 91, 13, 45.5, 2.6, 30.50, 0.52, 11.375
   A.11.375
   B.2.6
   C.30.50
   D.0.52
   E.None of these
   
   Answer & Explanation

   Answer – C.30.50
   Explanation :
   65*0.2 = 13
   91/2= 45.5
   13*0.2 = 2.6
   45.5/2 = 22.75
   2.6*0.2 = 0.52
   22.75/2 = 11.375
   
   
   
5. 4, 100, 296, 654, 988, 1484
   A.296
   B.1484
   C.988
   D.654
   E.None of these
   
   Answer & Explanation

   Answer –D.654
   Explanation :
   4+96 = 100
   100+196 = 296
   296+296 = 592
   592+396 = 988
   988+496 = 1484
   
   
   
6. 163, 86.5, 98.5, 159.75, 339.5, 873.5
   A.98.5
   B.163
   C.339.5
   D.873.5
   E.None of these
   
   Answer & Explanation

   Answer – A.98.5
   Explanation :
   163*0.5+5 = 86.5
   86.5*1+10 = 96.5
   96.5*1.5+15 = 159.75
   159.75*2+20 =339.5
   339.5*2.5+25 = 873.75
   
   
   
7. 2, 20, 30, 72, 90, 140, 182
   A.72
   B.140
   C.182
   D.30
   E.None of these
   
   Answer & Explanation

   Answer – B.140
   Explanation :
   2^2 -2 = 2
   4^2+4 = 20
   6^2-6 = 30
   8^2+8 = 72
   10^2-10 = 90
   12^2+12 = 156
   14^2-14 = 182
   
   
   
8. 342, 512, 728, 999, 1330, 1727
   A.512
   B.999
   C.1330
   D.1727
   E.None of these
   
   Answer & Explanation

   Answer – A.512
   Explanation :
   7^3-1 = 342
   8^3-1 = 511
   9^3 – 1 = 728
   10^3 – 1 = 999
   11^3 – 1 = 1330
   12^3 – 1 = 1727
   
   
   
9. 17, 23, 40, 63, 103, 166, 329, 435
   A.435
   B.166
   C.329
   D.103
   E.None of these
   
   Answer & Explanation

   Answer – C.329
   Explanation :
   17+23 = 40
   23+40 = 63
   40+63 = 103
   63+103 = 166
   103+166 = 269
   166+269 = 435
   
   
   
10. 531, 552, 535, 514, 531, 552, 535
    A.514
    B.552
    C.535
    D.531
    E.None of these
    
    Answer & Explanation

    Answer – E.None of these
    Explanation :
    531+21 = 552
    552-17 = 535
    535-21 = 514
    514+17 = 531
    531+21 = 552
    552-17 = 535