A number x is selected from the numbers 1,2,3 and then a second number y is randomly selected from the numbers 1,4,9. What is the probability that the product xy of the two numbers will be less than 9? (Ans: 5/9 )
Ans : Number X can be selected in three ways and corresponding to each such way there are three ways of selecting number y . Therefore , two numbers can be selected in 9 ways as listed below:
(1,1), (1,4), (2,1), (2,4), (3,1)
∴ Favourable number of elementary events = 5
Hence, required probability = 5/9