Question

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.

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

done, look at your later post.

Answer 2

I'll start 3 for you.

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

P(2W) = 2/9 * (2-1)/(9-1)

P(2P) = 7/9 * (7-1)/(9-1)

Either-or probabilities are found by adding the individual probabilities.