Number Series Quiz for RBI Assistant Mains / IBPS SO / IPPB Mains 2016-17

1. 18, 20, 44, 138, 560, _

A. 2800
B. 2810
C. 2820
D. 2830
E. None

Sol. B.2810
The pattern is *1 +2, *2 +4, *3 +6, *4 +8, *5 +10

2. 9, 15, 27, 45, 69, _

A. 109
B. 99
C. 91
D. 81
E. None

Sol. B.99
The pattern is +6, +12, +18, +24

3. 2, 5, 7, 12, 19, 31, 50, _

A. 53
B. 81
C. 69
D. 74
E. None

Sol. B.81
2+5 = 7
5+7 = 12
7+12= 19
12+19=31....

4. 1548, 516, 129, 43, _

A. 11
B. 10.75
C. 9.5
D. 12
E. None

Sol. B. 10.75
The pattern is *(1/3), *(1/4), *(1/3), *(1/4)

5. 121, 144, 190, 259, _, 466

A. 351
B. 349
C. 374
D. 328
E. None

Sol. A. 351
The pattern is +23, +46, +69, +92....

6. 7, 16, 45, 184, 915, _

A. 4560
B. 5640
C. 5496
D. 5696
E. None of these

Sol. 7*2 + 2 = 16
    16*3 - 3 = 45
    45*4 + 4 = 184
   184*5 - 5 = 915

   915*6 + 6 = 5496

7. 11, 20, 38, 74, _

A. 156
B. 164
C. 146
D. 142

Sol. 20 - 11 = 9*1
     38 - 20 = 9*2
     74 - 38 = 9*4

     X - 74 = 9*8
     X = 72 + 74 = 146    

8. 15, 21, 38, 65, 101, _

A. 146
B. 150
C. 145
D. 164
E. None of these

Sol. 21 - 15 = 6
     38 - 21 = 17
     65 - 38 = 27
     101 - 65 = 36

 Now subtracting these differences,
     17 - 6 = 11
     27 - 17 = 10
     36 - 27 = 9

     x - 36 = 8
     x = 44 

Now adding this to 101 we will get te next term,

= 101 + 44 = 145 

9. 24, 28, 19, 35, 10, _

A. 45
B. 59
C. 46
D. 64
E. None of these

Sol. 24 + 2^2 = 28
     28 - 3^2 = 19
     19 + 4^2 = 35
     35 - 5^2 = 10

     10 + 6^2 = 46  

10. 12, 19, 35, 59, 90, _

A. 117
B. 127
C. 147
D. 107
E. None of these

Sol. 19 - 12 = 7
     35 - 19 = 16
     59 - 35 = 24
     90 - 59 = 31

Now subtracting the differences,
     16 - 7 = 9
     24 - 16 = 8
     31 - 24 = 7

     x - 31 = 6
     x = 37

adding this to 90 we get the next term,

= 90 + 37 = 127.

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