Quantitative Aptitude: Number Series 34

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 should come in place of the question mark (?) in the following number series?

1. 3     732      1244      1587      1803      1928      ?
   A) 2010
   B) 1992
   C) 1781
   D) 1550
   E) 1227
   
   View Answer

     Option B
   Solution:
   732   –   3 = 729 = 9^3
   1244 – 732  = 512 = 8^3
   1587 – 1244 = 343 = 7^3
   1803 – 1587 = 216 = 6^3
   1928 – 1803 = 125 = 5^3
   1928 + 4^3 = 1928 + 64 = 1992
   
2. 8     11     17     ?     65     165.5      498.5
   A) 21.1
   B) 28.8
   C) 32
   D) 30.5
   E)  27.5
   
   View Answer

     Option D
   Solution:
   8 * 0.5 + 7 = 4 + 7 = 11
   11 * 1 + 6 = 17
   17  *  1.5  + 5 = 30.5
   30.5 * 2 + 4 = 61 + 4 = 65
   
3. 5     12     36     123       ?       2555      15342
   A) 508
   B) 415
   C) 510
   D) 488
   E) 498
   
   View Answer

     Option  A
   Solution:
   5 * 1 + 1 * 7 = 12
   12 * 2 + 2 * 6 = 36
   36 * 3 + 3 * 5 = 123
   123 * 4 + 4 * 4 = 508
   508 * 5 + 5 * 3 = 2555
   
4. 4.5       ?       25.5       33         38.5         42       43.5
   A) 10
   B) 22
   C) 20
   D) 18
   E) 16
   
   View Answer

     Option E
   Solution:
   4.5 + 11.5  = 16
   16  + 9.5 = 25.5
   25.5 + 7.5 = 33
   33 + 5.5 = 38.5
   
5. 1     2    6     21      88   445    ?
   A) 1908
   B) 2676
   C) 2150
   D) 1500
   E) 1880
   
   View Answer

     Option B
   Solution:
   1 * 1 + 1 = 2
   2 * 2 + 2 = 6
   6 * 3 + 3 = 21
   21 * 4 + 4 = 88
   88 * 5 + 5 = 445
   445 * 6 + 6 = 2676
   

Directions(6-10): In each questions below, a number series is given in which one number is wrong. Find out the wrong number.

6. 13       13       65        585      7605     129285
   A) 129285
   B) 585
   C)  13
   D) 65
   E) 7605
   
   View Answer

     Option C
   Solution:
   13  * 1 = 13
   13 * 5 = 65
   65 * 9 = 585
   585 * 13 = 7605
   7605 * 17 = 129285
7. 1331       2197       3370      4914       6859
   A)  2197
   B) 1331
   C) 3370
   D) 4914
   E) 6859
   
   View Answer

     Option C
   Solution:
   11 * 11 * 11 = 1331
   13 * 13 * 13 = 2197
   15 * 15 * 15 = 3375
   17 * 17 * 17 = 4914
   19 * 19 * 19 = 6859
   
8. 4       210         369       513        634       734
   A) 447
   B) 330
   C) 215
   D) 200
   E) 450
   
   View Answer

     Option D
   Solution:
   4 + 14^2 = 4 + 196 = 200
   200 + 13^2 = 200 + 169 = 369
   369 + 12^2 = 369 + 144 = 513
   513 +11^2 = 634 + 121 = 634
   634 + 10^2 = 634 + 100 = 734
   
9. 4       11     24      53       109    221
   A) 25
   B) 4
   C) 53
   D) 11
   E) 109
   
   View Answer

     Option  A
   Solution:
   4 + 1 * 7 = 11
   11 + 2 * 7 = 25
   25 + 4 * 7 = 53
   53 + 8 *7 = 109
   109 + 16 * 7 = 221
   
10. 15     18    15    19     17       20
    A) 20
    B) 16
    C) 19
    D) 18
    E) 17
    
    View Answer

      Option B
    Solution:
    15 + 3 = 18
    18 – 2 = 16
    16 + 3 = 19
    19 – 2 = 17
    17  + 3 = 20
    

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