Two numbers are randomly selected from 3, 4, 7, 8 and 9. What is the probability that product of these 2 is even?

Question

Two digits are selected at random from digits 1 through 9. If sum is even, find the probability that both numbers are odd?

Answer 1

there are three odd and two even numbers. the probability of the product being odd is when both are odd. this probability is 3C2/5C2=6/20 or 3/10. Hence the probability of product being even is 1-3/10=7/10