There are 25 tickets numbered as 1, 2, 3, 4, ....., 25 respectively. One ticket is drawn at random. What is the probability that the number on the ticket is a multiple of 3 or 5?
Total numbers of elementary events are: 25
Let E be the event of getting a multiple of 3 or 5
The favourable numbers are: 3, 6, 9, 12, 15, 18, 21, 24, 5, 10, 15, 20, 25
Numbers of favourable events = 13
P (E) = 13/25