1. 

What should come in the place of question mark (?) in the following alpha numeric series?

A2I, E4J, I8K, O16L, ?
A. U32M
B. U16N
C. U18N
D. U32L

Answer: Option A

Explanation:

Pattern of the series as shown below

First letter of each term is a series of consecutive vowels, numbers are moved as 2, 22, 23, 24, 25 and third letter of each term is increasing consecutively.

Hence, the missing term is U32M.