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.

Answer 1

1. Pr(p, w)=7/9*2/8
2. pr(w,w)=2/9, 1/8
3. obviously, purple then purple is greatest chance
Pr(p,p)=7/9,6/8
Pr(w,w)=2/9,1/8

Answer 2

THANK YOU!!