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OpenStudy (anonymous):
A box contains 3 green balls and 9 blue balls. Two balls are selected at random one after the other without replacement. What is the probability that the second one is blue?
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OpenStudy (anonymous):
17/22
OpenStudy (anonymous):
Average the 2 probabilities post 1st removal.
OpenStudy (anonymous):
It says the answer is 1/3
OpenStudy (anonymous):
Can you figure out the probability of getting a blue ball on the first pull?
OpenStudy (anonymous):
Wouldn't it be 9/12?
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OpenStudy (anonymous):
Okay, good. Now, the ball is not being replaced, so you know there are only 11 balls on the second pull. Right?
OpenStudy (anonymous):
Yes
OpenStudy (anonymous):
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