How many words can be formed by using all letters of the word ‘RIO’ ?	Choose the correct choice from the following: A) 6 B) 7 C) 8 D) 9 E) 10
Solution   The word RIO contains 3 different letters.   Required number of words = 3P3 = 3 ! = (3 x 2 x 1) = 6   6nswer 6
<result>A</result>
How many words can be formed by using all letters of the word ‘RIO’ ?