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

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