5) Tickets numbered 1 to 30 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?

Here is S ={1,2,3,4,5,6,7,8..........,27,28,29,30}

Which is p(S)

Now we take multiple of 3 and 5, E={3,6,9,12,15,18,21,24,27,30,5,10,20,25} which is P(E)

Now taking probability formula

P = P(E)/P(S) = 14/30