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? Show your work.

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? Show your work.

anonymous · Answer

first is purple, probability is $\frac{7}{9}$
second is white given the first is purple probability is $\frac{2}{8}$
both happen, multiply the probabilities $$\frac{7}{9}\times \frac{2}{8}$$

anonymous · Answer

@satellite73 hi!! i've been waiting for somebody to help me all night, can you pleaseee help me when you're done here? :)

anonymous · Answer

two white marbles:
probability first is white is $\frac{2}{9}$
probability second is white given that the first is white is $\frac{1}{8}$
again probability both happen is 
$$\frac{2}{9}\times \frac{1}{8}$$

anonymous · Answer

third one is rather obvious, since there are many more purple marbles than white ones

anonymous · Answer

@erin512  repost and i will look

meilendurcer · Answer

I am done thanks.

anonymous · Answer

ok good

anonymous · Answer

@satellite73 just reposted