The event that may not happen is an unlikely event
In other words, unlikely event is an event that is not likely to happen.
The following are examples of unlikely events
You will win a trip to New Zealand
Throwing ten 5's in a row
Tossing ten tails in a row
A. a likely event
B. an unlikely event
C. an equally likely event
Correct answer: B
Step 1: The event may not happen
Step 2: So, it is an unlikely event.