What is the probability of an event that is certain to occur?
Probability defines the likelihood of occurrence of an event.
Answer: The probability of an event that is certain to occur is 1.
Let's look into an example to understand this.
An event whose occurrence is 100% sure, those events are called certain events.
The probability of such an event is always 1.
Example: The probability of getting a number between 1 to 6 when rolling a die is a certain event.