Brian buys 15 raffle tickets. 585 are sold in total. There is only one winner. Brian thinks the probability he will win is 1/40. Is he correct?

Question

Brian buys 15 raffle tickets. 585 are sold in total. There is only one winner. Brian thinks the probability he will win is 1/40. Is he correct?

Answer 1

15/585 = 1/39 so the probability of a win is slightly greater than 1/40.  Brian is almost right, but not 100% accurate.