Write the probability of a sure event. - Vidyadip

Question

Write the probability of a sure event.

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Answer

The probability of a sure event is $1$ i.e.p(s) $=1$ where $s$ is the sure event.
Proof: In a sure event $n(E)=n(s)$
[Since number of elements in Event ' $E$ ' will be equal to the number of element in samplespace.]
By definitions of probability :
$P(s)=n(E) / n(s)=1$
$p(s)=1$

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