Quantitative Aptitude: Number Series 33

Quantitative Aptitude Questions for IBPS RRB/PO/Clerk, SBI PO, NIACL, NICL, RBI Grade B/Assistant, UIICL, OICL and other competitive exams.

Directions(1-5): What will come in place of question mark in the given number series.

1. 17 9      15     40      5       ?
   A) 620
   B) 650.25
   C) 550.5
   D) 688
   E) 540.15
   
   View Answer

     Option  B
   Solution:
   17 * 0.5 + 0.5 = 9
   9 * 1.5 + 1.5 = 15
   15 * 2.5 + 2.5 = 40
   40 * 3.5 + 3.5 = 143.5
   143.5 * 4.5 + 4.5 = 650.25
   
2. 2     9     25      82      335      ?
   A) 1456
   B) 1246
   C) 1682
   D) 1560
   E) 1550
   
   View Answer

     Option C
   Solution:
   2 * 1 + 7 = 9
   9 * 2 + 7 = 25
   25 * 3 + 7 = 82
   82 * 4 + 7 = 335
   335 * 5 + 7 = 1682
   
3. 1548      516     129     43     ?
   A) 9.82
   B) 11.11
   C)13.25
   D)10.75
   E) 11.25
   
   View Answer

     Option D
   Solution:
   1548/ 3   = 516
   516/4 = 129
   129/3 = 43
   43/4 = 10.75
   
4. 41      164       2624       ?        6045696
   A)94464
   B) 84500
   C)94502
   D) 78542
   E) 82456
   
   View Answer

     Option B
   Solution:
   41  *   2^2 = 164
   164  *  4^2 = 2624
   2624  *  6^2 = 94464
   94464  *  7^2 = 6045696
   
5. 4       9       29       119       599        ?
   A) 2998
   B) 4578
   C) 3245
   D) 2000
   E) 3599
   
   View Answer

     Option E
   Solution:
   4 * 2 + 1 = 9
   9*3  + 2 = 29
   29 * 4 + 3 = 119
   119* 5 + 4 = 599
   599*6 +5=3599
   

   Directions(6-10): In the  following number series only one number is wrong. Find the wrong number.

6. 133     183     241      307     381      463     480
   A) 307
   B) 133
   C) 480
   D) 241
   E) 381
   
   View Answer

     Option  C
   Solution:
   133 + 50 = 183
   183 + 58 = 241
   241 + 66 = 307
   307 + 74 = 381
   381 + 82 = 463
   463 + 90 = 553
   
7. 31     15      21    50    155.3      767.25
   A) 767.25
   B) 155.3
   C) 15
   D) 31
   E) 50
   
   View Answer

     Option B
   Solution:
   31 * 0.5 – 0.5 = 15
   15 * 1.5 – 1.5 = 21
   21 * 2.5 – 2.5 = 50
   50 * 3.5 – 3.5 = 171.5
   171.5  *  4.5 – 4.5 = 767.25
   
8. 18       119      708       3530       14136      42405
   A) 14136
   B) 708
   C) 119
   D) 3530
   E) 42405
   
   View Answer

     Option D
   Solution:
   18 * 7 – 7 = 119
   119* 6 – 6 = 708
   708 * 5 – 5 = 3540
   3540 * 4 – 4 = 14136
   14136 * 3 – 3 = 42405
   
9. 500     484     451      384      260      80
   A) 80
   B) 260
   C) 451
   D) 484
   E) 500
   
   View Answer

     Option B
   Solution:
   500 – 16 = 484
   484 – 33(= 16 + 17) = 451
   451 – 67(= 33 + 2 * 17) = 384
   384 – 118(= 67 + 3 * 17)= 266
   266 – 186(= 118 + 4 * 17)= 80
   
10. 9    10.8    18     21.6     36      64.8
    A) 21.6
    B) 10.8
    C) 36
    D) 18
    E) 9
    
    View Answer

      Option D
    Solution:
    9 + 1.8 = 10.8
    10.8 + 2* 1.8 = 14.4
    14.4 + 2 *3.6 = 21.6
    21.6 + 2*7.2 = 36
    36+ 2 * 14.4 = 64.8
    

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