Tickets numbered from 1 to 20 are mixed up and a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 7?

Question

Philoid · Accepted Answer

Sample space, n(S) = 20

Number of events of getting a multiples of 3 or 7 on the drawn ticket, n(E) = 8 {3,6,9,12,15,18,7,14}