Aptitude Questions: Number Series Set 32

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 !!!

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. 5 7 16 57 244 1245 7506
   A. 5
   B. 16
   C. 7506
   D. 7
   E. None of these
   
   Answer & Explanation

   Answer – D. 7
   Explanation :
   (5 * 1) + 1² = 6
   (6 * 2) + 2² = 16….
   Correct Number: 6
   
   
2. 5 3 4 7.5 17 47 138
   A. 5
   B. 4
   C. 47
   D. 17
   E. None of these
   
   Answer & Explanation

   Answer – C. 47
   Explanation :
   5 * 0.5 + 0.5 = 3
   3 * 1 + 1 = 4
   4 * 1.5 + 1.5 = 7.5…..
   Correct Number: 45
   
   
3. 3 5 13 43 178 891 5353
   A. 43
   B. 178
   C. 891
   D. 5353
   E. None of these
   
   Answer & Explanation

   Answer – B. 178
   Explanation :
   3 * 1 + 2 = 5
   5 * 2 + 3 = 13
   13 * 3 + 4 = 43…..
   Correct Number: 177
   
   
4. 972 484 240 118 56 26.5 11.25
   A. 240
   B. 11.25
   C. 118
   D. 56
   E. None of these
   
   Answer & Explanation

   Answer – D. 56
   Explanation :
   972 / 2 – 2 = 484
   484 / 2 – 2 = 240
   240 / 2 – 2 = 118…..
   Correct Number: 57
   
   
5. 25 313 457 529 565 585 592
   A. 457
   B. 592
   C. 313
   D. 529
   E. None of these
   
   Answer & Explanation

   Answer – E. None of these
   Explanation :
   25 + 9 * 32 = 313
   313 + 9 * 16 = 457
   457 + 9 * 8 = 529….
   Wrong Number: 585
   Correct Number: 583
   
   
6. 25 35 50 75 110 155 210
   A. 50
   B. 210
   C. 25
   D. 110
   E. None of these
   
   Answer & Explanation

   Answer – C. 25
   Explanation :
   30 + 5 * 1 = 35
   35 + 5 * 3 = 50
   50 + 5 * 5 = 75…..
   Wrong Number: 25
   Correct Number: 30
   
   
7. 900 890 879 858 830 795 753
   A. 753
   B. 795
   C. 890
   D. 858
   E. None of these
   
   Answer & Explanation

   Answer – C. 890
   Explanation :
   900 – 7 = 893
   893 – 14 = 879
   879 – 21 = 858……
   Wrong Number: 890
   Correct Number: 893
   
   
8. 16800, 7770, 1290, 3120, 1000, 240, 30
   A. 1000
   B. 7770
   C. 3120
   D. 78
   E. None of these
   
   Answer & Explanation

   Answer – A. 1000
   Explanation :
   7^5 – 7, 6^5 – 6, 5^5 – 5, 4^5 – 4…
   Wrong Number: 1000
   Correct Number: 1020
   
   
9. 15 22 32 111 428 1538 12900
   A. 22
   B. 428
   C. 1538
   D. 12900
   E. None of these
   
   Answer & Explanation

   Answer – D. 12900
   Explanation :
   15 * 1 + (1 * 7) = 22
   22 * 2 – (2 * 6) = 32
   32 * 3 + (3 * 5) = 111
   111 * 4 – (4 * 4) = 428
   428 * 5 + (5 * 3) = 2155
   2155 * 6 – (6 * 2) = 12918
   Correct Number: 12918
   
   
10. 2580 645 322.5 80.62 45 10.07 5
    A. 322.5
    B. 645
    C. 45
    D. 10.07
    E. None of these
    
    Answer & Explanation

    Answer – C. 45
    Explanation :
    2580 * 0.25 = 645
    645 * 0.5 = 322.5
    322.5 * 0.25 = 80.62
    80.62 * 0.5 = 40.31 …..
    Correct Number: 40.31