Sum
Write the probability of a sure event
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Solution
The probability of a sure event is 1i.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 definitions of probability:
P(s)=n(E)/n(s)=1
p(s)=1
Concept: Probability - A Theoretical Approach
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