A hat contains 18 raffle tickets, numbered 1 through 18. If two raffle tickets are chosen at random from the hat, what is the probability that both tickets are even numbers?
A.[m]2/9[/m]
B.[m]4/17[/m]
C.[m]1/4[/m]
D.[m]1/2[/m]
E.[m]33/34[/m]
我的答案:
A hat contains 18 raffle tickets, numbered 1 through 18. If two raffle tickets are chosen at random from the hat, what is the probability that both tickets are even numbers?