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Question
A single letter is selected at random from the word 'PROBABILITY'. What is the probability that it is a vowel?
Solution
There are 11 letters in the word 'PROBABILITY'.
i.e. n(S) = 11
There are 4 vowels (O, A, I, I) in the given word.
i.e. n(vowel) = 4
∴ Probability (vowel) = \[\frac{4}{11}\]
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