Aptitude Questions: Number Series Set 44

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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 !!!

Directions(1-10): In these questions, a number series is given. Only one number is wrong which does not fit in the series. Find out the wrong number.

1. 34, 40, 57, 86, 128, 185, 255
   1.40
   2.128
   3.57
   4.185
   5.None of these
   
   Answer & Explanation

   Answer – 4.185
   Explanation :
   40 – 34 = 6
   57 – 40 = 17
   86 – 57 = 29
   128 – 86 = 42; 17 – 6 = 11; 29 – 17 = 12; 42 – 29 = 13
   Wrong Number: 185
   Correct Number: 184
   
   
2. 8, 12, 23, 73, 297, 1491, 8953
   1.8952
   2.8
   3.298
   4.10
   5.None of these
   
   Answer & Explanation

   Answer – 4.10
   Explanation :
   8 * 1 + 2 = 10
   10 * 2 + 3 = 23
   23 * 3 + 4 = 73
   73 * 4 + 5 = 297
   297 * 5 + 6 = 1491
   Wrong Number: 12
   Correct Number: 10
   
   
3. 7, 4, 5, 9, 21, 52.5, 160.5
   1.160.5
   2.5
   3.21
   4.7
   5.None of these
   
   Answer & Explanation

   Answer –3.21
   Explanation :
   7 * 0.5 + 0.5 = 4
   4 * 1 + 1 = 5
   5 * 1.5 + 1.5 = 9
   9 * 2 + 2 = 20
   20 * 2.5 + 2.5 = 52.5
   Wrong Number: 21
   Correct Number: 20
   
   
4. 14 21 30 105 404 2045 12198
   1. 21
   2. 14
   3. 30
   4. 2045
   5. None of these
   Answer – 3. 1538
   
   Answer & Explanation

   Answer – 4. 2045
   Explanation :
   Explanation :
   14 * 1 + (1 * 7) = 21
   21 * 2 – (2 * 6) = 30
   30 * 3 + (3 * 5) = 105
   105 * 4 – (4 * 4) = 404
   404 * 5 + (5 * 3) = 2035
   Wrong Number: 2045
   Correct Number: 2035
   
   
5. 434, 418, 393, 357, 308, 244, 153
   1.357
   2.393
   3.418
   4.153
   5.None of these
   
   Answer & Explanation

   Answer –4.153
   Explanation :
   434 – 4²= 418
   418 – 5²= 393
   393 – 6²= 357
   357 – 7²= 308
   308 – 8²= 244
   244 – 9²= 163
   Wrong Number: 153
   Correct Number: 163
   
   
6. 8, 19, 42, 74, 118, 173, 239
   1.42
   2.239
   3.19
   4.8
   5.None of these
   
   Answer & Explanation

   Answer – 1.42
   Explanation :
   8 + 11 = 19
   19 + 22 = 41
   41 + 33 = 74
   74 + 44 = 118
   118 + 55 = 173
   Wrong Number: 42
   Correct Number: 41
   
   
7. 40, 45, 60, 75, 120, 165, 220
   1.60
   2.40
   3.75
   4.165
   5.None of these
   
   Answer & Explanation

   Answer – 3.75
   Explanation :
   40 + 5 * 1 = 45
   45 + 5 * 3 = 60
   60 + 5 * 5 = 85
   85 + 5 * 7 = 120
   120 + 5 * 9 = 165
   165 + 5 * 11 = 220
   Wrong Number: 75
   Correct Number: 85
   
   
8. 960 953 939 918 890 855 810
   1. 960
   2. 953
   3. 855
   4. 939
   5. None of these
   
   Answer & Explanation

   Answer – 5. None of these
   Explanation :
   960 – 7 = 953
   953 – 14 = 939
   939 – 21 = 918……
   Wrong Number: 810
   Correct Number: 813
   
   
   
9. 972 484 240 118 57 26 11.25
   1. 240
   2. 130
   3. 57
   4. 26
   5. None of these
   Answer – 2. 130
   
   Answer & Explanation

   Answer – 4. 26
   Explanation :
   972/2 – 2 = 484
   484/2 – 2 = 240
   240/2 – 2 = 118
   118/2 – 2 = 57……
   Wrong Number: 26
   Correct Number: 26.5
   
   
   
10. 5 6 16 57 240 1245 7506
    1. 5
    2. 57
    3. 240
    4. 7
    5. None of these
    Explanation :
    
    Answer & Explanation

    Answer – 3. 240
    Explanation :
    5 * 1 + (1*1) = 6
    6 * 2 + (2*2) = 16
    16 * 3 + (3*3) = 57
    Wrong Number: 240
    Correct Number: 244