1.   Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
165, 195,  255, 285, 345, ?

A. 375
B. 390
C. 420
D. 435

Answer: Option D

Explanation:

Each number of the series is 15 multiplied by a prime number i.e. 15 × 11. 15 × 13. 15 × 17, 15 × 19, 15 × 23. ..... So, missing term = 15 × 29 = 435.