Quantitative Aptitude: Number Series 31

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): Find the missing number in the following number series.

1. 20     24     33    49     74     ?
   A) 115
   B) 88
   C) 96
   D) 110
   E) 123
   
   View Answer

     Option D
   Solution:
   20 + 2^2 = 24
   24 + 3^2 = 24
   33 + 4^2 = 49
   49 + 5^2 = 74
   74 + 6^2 = 110
2. 1     ?     27    64     125
   A) 8
   B) 11
   C) 12
   D) 16
   E) None of these
   
   View Answer

     Option A
   Solution:
   1  = 1^3
   ? = 2^3 = 8
   3 = 3^3
   4 = 4^3
   5 = 5^3
3. 12   14    17    13   ?   14   21    13
   A) 11
   B) 8
   C) 10
   D) 12
   E) None of these
   
   View Answer

     Option B
   Solution:
   12…..(+2)……14….(+3)…..17…..
   (-4)……13……(-5)……8……(+6)……14……(+7)…..21…..(-8)…..13
   +2, +3, -4, -5, +6, +7, -8
   
4. 5    11     ?      55      117
   A) 22
   B) 25
   C) 33
   D) 30
   E) None of these
   
   View Answer

     Option B
   Solution:
   5  * 2 + 1 = 11
   11 * 2 + 3 = 25
   25 * 2 + 5 = 55
   55 * 2 + 7 = 117
   
5. 85     43    44    67.5     ?     345
   A) 125
   B) 140
   C) 137
   D) 112
   E) None of these
   
   View Answer

     Option C
   Solution:
   85 * 0.5 + 0.5 = 43
   43 * 1 + 1 = 44
   44 * 1.5 + 1.5 = 67.5
   ? = 67.5 * 2  + 2 = 137
   137 * 2.5 + 2.5 = 345

Directions(6-10): In each of the following questions number series, there is a wrong number that does not follow the pattern of the series. Find the wrong number.

6. 62    87    187    420    812    1437
   A) 87
   B) 187
   C) 420
   D) 812
   E) None of these
   
   View Answer

     Option C
   Solution:
   62 + 5^2 = 62 + 25 = 87
   87 + 10^2 = 87 + 100 = 187
   187 + 15^2 = 187 + 225 = 412
   412 + 20^2 = 412 + 400 = 812
   812 + 25^2 = 812 + 625 = 1437
   
7. 120    137    170    222    290   375
   A) 137
   B) 170
   C) 222
   D) 290
   E) 375
   
   View Answer

     Option B
   Solution:
   120 + 1 * 17 = 137
   137 + 2 *17 = 171
   171 + 3 * 17 = 222
   222 + 4 * 17 = 290
   290 + 5 * 17 = 375
8. 550   542   537   521    496   460
   A) 496
   B) 521
   C) 537
   D) 542
   E) 460
   
   View Answer

     Option D
   Solution:
   550 – 2^2 = 546
   546 – 3^2 = 537
   537 – 4^2 = 521
   521 – 5^2 = 496
   496 – 6^2 = 460
   
9. 12      48     168     500    1260   2520
   A) 500
   B) 168
   C) 48
   D) 1260
   E) 2520
   
   View Answer

     Option A
   Solution:
   12 * 4 = 48
   48 * 3.5 = 168
   168 * 3 = 504
   504 * 2.5 = 1260
   1260 * 2 = 2520
   
10. 24   536   487    703     670    742
    A) 536
    B) 487
    C) 670
    D) 703
    E)742
    
    View Answer

      Option C
    Solution:
    24 + 8^3 = 536
    536  – 7^2 = 487
    487 + 6^3 = 703
    703 – 5^2 = 678
    678 + 4^3 = 742

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