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.

What is the probability of selecting a purple marble and then a white marble?
What is the probability of selecting two white marbles?
Is there a greater chance of selecting two white marbles in a row or two purple marbles in a row?

Answer 1

Please help me! Thanks.

-Vivid

Answer 2

1) \[7/9*2/8= 7/36\]
2) \[2/9*1/8=1/36\]
3) 2 white marbles: \[2/9*1/8=1/36\]
2 purple marbles: \[7/9*6/8= 7/12\]