A single letter is selected at random from the word ‘PROBABILITY’. What is the probability that it is a vowel?
As there are 9 distinct letters in “PROBABILITY” (P,R,O,B,A,I,L,T,Y).
∴ A single letter can be selected in 9 ways.
As there are 3 vowels in “PROBABILITY”.
∴ 1 vowel can be selected in 3 ways
∴ P(selected letter is vowel) = 3/9 = 1/3