# Write the Probability of a Sure Event - Mathematics

Sum

Write the probability of a sure event

#### 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

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#### APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 25 Probability
Exercise 25 (A) | Q 9.1 | Page 386