Tickets for an upcoming concert are sold out but a local charity is having a raffle and the prize is a pair of tickets to the concert. One hundred people enter the raffle, so each individual who entered has 1/100 probability of winning the pair of tickets. You and a friend both entered. What is the probability that one or the other of you wins the tickets?
A) 1/100
B) 2/100
C) (1/100)(1/100)
D) 2/100 - (1/100)(1/100)

Question

Quizplus · Accepted Answer

The probability of you or your friend winning is the sum of your individual probabilities, since these are independent events. Each of you has a 1/100 chance, so together it's 2/100 or 1/50.

Tickets for an Upcoming Concert Are Sold Out but a Local