There are 20 tickets numbered as 1, 2, 3, ...., 20 respectively. One ticket is drawn at random. What is the probability that the number on the ticket drawn is a multiple of 5?
Total numbers of elementary events are: 20
Let E be the event of getting a multiple of 5
Favourable numbers are: 5, 10, 15, 20
Number of favourable events are= 4
P (E) = 4/20 = 1/5