Number Series Questions Quiz with PDF for LIC Assistant 2021 , NRA CET , SBI Clerk Pre , IBPS Clerk Pre , IBPS RRB at Smartkeeda

Directions : What will come in place of question mark (?) in the following series?
1
35     210     1050      4200       ?       25200
» Explain it
A
Series Pattern  Given Series  
35 35  
35 × 6 = 210 210  
210 × 5 = 1050 1050  
1050 × 4 = 4200 4200  
4200 × 3 = 12600 12600
12600 × 2 = 25200 25200  

Hence, option (A) is correct.
2
25     32     37      47       58       ?
» Explain it
B
Series Pattern  Given Series  
25 25  
25 + (2 + 5) = 32 32  
32 + (3 + 2) = 37 37  
37 + (3 + 7) = 47 47  
47 + (4 + 7) = 58 58  
58 + (5 + 8) = 71 71

Here, digits of a number are being added to give us the next term in the series.

Hence, option (B) is correct.
3
240     122     64      36       23       ?
» Explain it
C
Series Pattern  Given Series  
240 240  
240 ÷ 2 + 2 = 122 122  
122 ÷ 2 + 3 = 64 64  
64 ÷ 2 + 4 = 36 36  
36 ÷ 2 + 5 = 23 23  
23 ÷ 2 + 6 = 17.5 17.5

Hence, option (C) is correct.
4
45     49     40      56       ?       67
» Explain it
D
Series Pattern  Given Series  
45 45  
45 + 22 = 49 49  
49 – 32 = 40 40  
40 + 42 = 56 56  
56 – 52 = 31 31
31 + 62 = 67 67  

Hence, option (D) is correct.
5
256     374     504      646       800       ?
» Explain it
A
Series Pattern  Given Series  
256 256  
256 + 118 = 374 374  
374 + 130 = 504 504  
504 + 142 = 646 646  
646 + 154 = 800 800  
800 + 166 = 966 966

Hence, option (A) is correct.