Quants Questions : Number Series Set 12

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 !!!

1. 7,9,15,27, ?
   A)74
   B)47
   C)63
   D)59
   E)None of these
   
   Answer

   B)47
   Explanation :
   7+(1²+1) = 7+2 = 9
   9+(2²+2) = 9+6 = 15
   15+(3²+3) = 15+12 = 27
   27+(4²+4) =27+20 = 47
   
   
   
2. 63, 64.8, 67, 69.6 , ?
   A)91.4
   B)81.2
   C)72.6
   D)76.3
   E)None of these
   
   Answer

   C)72.6
   Explanation :
   63+1.8 = 64.8
   64.8+2.2 = 67
   67+2.6 = 69.6
   69.6+3 =72.6
   
   
   
3. 19, 36, 70, 121, ?
   A)234
   B)197
   C)213
   D)189
   E)None of these
   
   Answer

   D)189
   Explanation :
   19+17 = 36
   36+34 = 70
   70+51 = 121
   121+68 = 189
   
   
   
4. 121, 120, 116, 107, 91, ?
   A)73
   B)45
   C)53
   D)66
   E)None of these
   
   Answer

   D)66
   Explanation :
   121 – 1²  = 121-1 = 120
   120 – 2²  = 120 -4 = 116
   116- 3² = 116-9 = 107
   107-4² = 107 – 16 = 91
   91 – 5² = 91 – 25 = 66
   
   
   
5. 213, 217, 210, 214, 207, 211, ?
   A)215
   B)245
   C)204
   D)323
   E)None of these
   
   Answer

   C)204
   Explanation :
   213 +4 = 217
   217 – 7 = 210
   210+4 = 214
   214-7 = 207
   207+4 = 211
   211-7 = 204
   
   
   
6. 816, 812, 404, 1200, 299, ?
   A)1324
   B)1475
   C)1275
   D)1534
   E)None of these
   
   Answer

   B)1475
   Explanation :
   (816 – 4)*1 = 812
   (812 – 4)÷2 = 404
   (404 – 4)*3 = 1200
   (1200 – 4)÷4 = 299
   (299 – 4)*5 = 1475
   
   
   
7. 124, 120.5, 113.5, 103, 89, ?
   A)78.4
   B)65.4
   C)71.5
   D)81.5
   E)None of these
   
   Answer

   C)71.5
   Explanation :
   124 – 3.5 = 120.5
   120.5 – 7 = 113.5
   113.5-10.5 = 103
   103 – 14 = 89
   89 – 17.5 = 71.5
   
   
   
8. 725, 724, 716, 689, 625, ?
   A)750
   B)528
   C)465
   D)500
   E)None of these
   
   Answer

   D)500
   Explanation :
   725 – 1³ = 724
   724 – 8 = 716
   716 – 27 = 689
   689 – 64 = 625
   625 – 125 = 500
   
   
   
9. 17, 22.5, 50.5, 157, 633.5, ?
   A)3173
   B)2345
   C)1347
   D)2457
   E)None of these
   
   Answer

   A)3173
   Explanation :
   17*1 + 5.5 = 22.5
   22.5*2+5.5 = 50.5
   50.5*3+5.5 = 157
   157*4+5.5 = 633.5
   633.5*5+5.5 = 3173
   
   
   
10. 2, 13, 35, 79, 167, ?
    A)416
    B)343
    C)321
    D)257
    E)None of these
    
    Answer

    B)343
    Explanation :
    2+11 = 13
    13+22 = 35
    35+44 = 79
    79+88 = 167
    167+176 = 343