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Question
A single letter is selected at random from the word ‘Probability’. Find the probability that it is a vowel.
Solution
Possible outcomes = S = {'P', 'r', 'o', 'b', 'a', 'b', 'i', 'l', 'i', 't, 'y'}
n(S) = 11
Event of selection of vowels = E = {'o', 'a', 'i', 'i'}
n(E) = 4
Probability of selection of a vowel = P(S)
= `"n(E)"/"n(S)"`
= `4/11`
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