Question

The probability of a sure event (or certain event) is ____

• A. $0$
• B. $1$
• C. $2$
• D. $3$

Answer 1

The correct option is B $1$

Probability of event in $E$, $P\left(E\right)=\frac{\text{number of events in E}}{\text{Tota number of possible events}}$

If the number of desirable events is equal to the total number of possible events, then probability of an event which is certain or sure to happen $=1$

Such an event is called certaind event or sure event.