Answer:
Odds against the events are 7/9.
Explanation:
It is given that: 
Odds in favor of event = 2 : 9 or 2/9 
Let, 
These odds are out of 1. 
The odds against the event would be 
Odds against = 1 - 2/9 
Odds against = 

Odds against = 

Therefore, 
Odds against the events are 7/9.