1. 

In the following question, a number series is given with one of the terms missing. Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series.

5, 16, 51, 158, ?
A. 1452
B. 483
C. 481
D. 1454

Answer: Option C

Explanation:

Pattern of the series is as shown below

5 x 3 + 1 = 16

16 x 3 + 3 = 51

51 x 3 + 5 = 158

158 x 3 + 7 = 481

Hence, the question mark will be replaced by 481.