1. 

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

AY-12, CW-15, EU-18, GS-21, ?

A. IL-24
B. IQ-24
C. JQ-27
D. JR-21
E. JQ-24

Answer: Option B

Explanation:

Pattern of the series as shown below

letter-and-symbol-series-logical-reasoning-practice-level---letter-and symbol-series-problems

Hence, the missing term is IQ24.