Quantitative Aptitude: Number Series Set 59

Directions (1-5): The following series are based on a certain pattern. Find the number represented by question mark (?) in the following series:

1. 45   47   90   276   ?   5470
   A) 1050
   B) 975
   C) 1096
   D) 1123
   E) None
   
   View Answer

   Option C
   Solution:
   45*1 +2 =47
   47*2 -4=90
   90*3+6=276
   276*4 -8=1096.
2. 194   194   191   183   168 ?
   A) 148
   B) 163
   C) 156
   D) 144
   E) None
   
   View Answer

   Option D
   Solution:
   194 – (1*1 – 1) = 194
   194 – (2*2 – 1) = 191
   191 – (3*3 – 1) = 183
   183 – (4*4 – 1) = 168
   168 – (5*5 – 1) = 144.
3. 124   215   342   511   ?    999
   A) 728
   B) 654
   C) 772
   D) 638
   E) None
   
   View Answer

   Option A
   Solution:
   5³ – 1 = 124
   6³ – 1 = 215
   7³ – 1 = 342
   8³ – 1 = 511
   9³ – 1 = 728.
4. 16   9   10   16   33   ?
   A) 65
   B) 68.2
   C) 83.5
   D) 85
   E) None
   
   View Answer

   Option C
   Solution:
   16*.5+1=9
   9*1+1=10
   10*1.5+1=16
   16*2+1 =33
   33*2.5+1=83.5.
5. 2   7  10   22   18   37   26  ?
   A) 42
   B) 52
   C) 64
   D) 48
   E) None
   
   View Answer

   Option B
   Solution:
   2, 10, 18, 26, … (Increased by 8)
   7, 22, 37, … (Increased by 15)
   Hence, next term is 37+15 = 52.

Directions (6-10): The following series are based on a certain pattern. One of the number in series is wrong. Find that off one out.

6. 385   473   561   544   682   792
   A) 544
   B) 385
   C) 473
   D) 792
   E) 561
   
   View Answer

   Option A
   Solution:
   In each number except 544, the middle digit is the sum of other two digits.
7. 3   7   15   27   63   127  255
   A) 63
   B) 15
   C) 255
   D) 27
   E) 127
   
   View Answer

   Option D
   Solution:
   3*2+1=7
   7*2+1=15
   15*2+1=31(27) (Its wrong ).
8. 1   8   27   72   125   216   343
   A) 8
   B) 72
   C) 8
   D) 125
   E) 343
   
   View Answer

   Option B
   Solution:
   All are cube numbers except 72.(64)
9. 6   25   62   123   215   341
   A) 6
   B) 341
   C) 123
   D) 25
   E) 215
   
   View Answer

   Option E
   Solution:
   2 ³ – 2 =6
   3³ – 2=25
   4³ – 2=62
   5 ³ – 1 =123
   6 ³ – 2=214 (215)(its wrong).
10. 3   6   12   20   30   42   56
    A) 56
    B) 30
    C) 20
    D) 3
    E) 12
    
    View Answer

    Option D
    Solution:
    1 * 2=2 (3)(its wrong)
    2 * 3=6
    3 * 4=12
    4 * 5=20
    5 * 6=30
    6 * 7=72
    7 * 8=56.

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