The table below shows the number of marbles of different colors in a bag:
color of marbles i number of marbles

pink i 6

blue i 3

green i 9

paige draws a marble from the bag randomly without looking. she then draws another marble from the bag without replacing the first one. which expression shows the probability of drawing pink marbles in both the trials?
a. (6/18) * (5/18)
b. (6/18) * (5/17)
c. (6/18) * (5/17)
d. (6/18) * (5/18)
?