ANSWER
1
Step-by-step explanation
First, it is important to know what a Sample space.
A Sample space of an event or experiment is the set or group of all the possible probabilities or outcomes that can occur in the event.
We know that in an event, at least one of the possible outcomes must occur.
This means that if we add up the probabilities of ALL the possible outcomes that can occur in an event, then it must give us 1.
Therefore, the sum of the probabilities of the events in the sample space is 1.