Complete the following statements:
$(i)$ Probability of an event $E +$ Probability of the event 'not $E$' $= \dots \dots \dots \dots \dots$
$(ii)$ The probability of an event that cannot happen is $\dots \dots \dots$. Such an event is called $\dots \dots \dots \dots \dots$
$(iii)$ The probability of an event that is certain to happen is $\dots \dots \dots$. Such an event is called $\dots \dots \dots \dots \dots$

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(A) $(i)$ The sum of the probabilities of an event $E$ and its complement 'not $E$' is always $1$. Thus,$P(E) + P(\text{not } E) = 1$.
$(ii)$ The probability of an event that cannot happen is $0$. Such an event is called an impossible event.
$(iii)$ The probability of an event that is certain to happen is $1$. Such an event is called a sure event or a certain event.

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