A teacher has a bag of marbles. there are 10 red, 10 blue, 8 green, 8 purple, and 8
yellow marbles in the bag. as the students enter the classroom, they draw a marble
and keep it. if the first student in the room draws a red, and the second draws a red,
what is the probability that the third student will draw a red?
17%
21%
15%
19%