The probability of an event which is certain to happen is $:$

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Solution

Probability of an event that is certain to happen:
If there are $n$ elementary events associated with a random experiment and $n$ of them are favourable to an event $A,$
then the probability of $n$ is certain is
$P (A) = \frac{n}{n}$
$= 1$
hence, the probability of an event that is certain to happen is $1$

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