A bag contains 2 white marbles and 7 purple marbles. Two marbles are drawn at random. One marble is drawn and not replaced. Then a second marble is drawn.

Question

1. What is the probability of selecting a purple marble and then a white marble?

2. What is the probability of selecting two white marbles?

3. Is there a greater chance of selecting two white marbles in a row or two purple marbles in a row? Show your work.

Please help I don't understand.

Answer 1

Very basic probability problems

2 white
7 purple, total of 9 marbles
prob(purple) = 7/9
since this marble is not returned, there are now only 8 marbles left
prob(white) = 2/8 or 1/4
So prob(purple, then white) = (7/9)(1/4) = 7/36

in the same way, prob(white, then white) = (2/9)(1/8) = 1/36

you do the last one, let me know what you get.

Answer 2

rose waiiiit are you in 6th grade cause from all of your posts im learning the same exact thing

Answer 3

7th

Answer 4

3. greater chance of choosing purple because there's 7 marbles vs 2