Complete the following statements:
$(i)$ The sum of the probabilities of all the elementary events of an experiment is .......
$(ii)$ The probability of an event is greater than or equal to ....... and less than or equal to .......

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(N/A) $(i)$ The sum of the probabilities of all elementary events of an experiment is $1$.
$(ii)$ The probability of an event $E$ is such that $0 \le P(E) \le 1$. Therefore,the probability of an event is greater than or equal to $0$ and less than or equal to $1$.

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