500
Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
Write the answer as a fraction.
3, 6 , 9, 12, 15, 18, 5, 10, 20
9/20 is the probability that the ticket drawn has a number which is a multiple of 3 or 5.