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Question
Write the probability of a sure event.
Solution
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 sample space.]
By definition of probability:
`P(S) = (n(E))/(n(S)) = 1`
P(S) = 1
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