Question:
From the letters of the word ''MOBILE", a letter is selected. The probability that the letter is a vowel, is
(a) $\frac{1}{3}$
(b) $\frac{3}{7}$
(c) $\frac{1}{6}$
(d) $\frac{1}{2}$
Solution:
GIVEN: A letter is selected from the word “MOBILE”
TO FIND: Probability that the letter chosen is a vowel
Total letter in the word “MOBILE” is 6
Vowels in the word “MOBILE” are ‘O’.’I’,’E’
Hence total number of favorable outcome is 3 i.e. ‘O’.’I’,’E’
We know that PROBABILITY = 
Hence probability that the letter chosen is a vowel 
Hence the correct option is