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OpenStudy (anonymous):
A bag contains 3 red marbles, 4 blue marbles, and 5 white marbles. What is the probability of pulling out two red marbles in a row if none are replaced?
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OpenStudy (anonymous):
probability of getting a first marble in the first try is?
OpenStudy (anonymous):
red marbles/ total marbles
OpenStudy (anonymous):
5 white marbles
OpenStudy (anonymous):
3
OpenStudy (anonymous):
3/12= 1/4
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OpenStudy (anonymous):
you have to account for the other marbles as well
OpenStudy (anonymous):
now for the second try you have to subtract one red marble and one from total marble
OpenStudy (anonymous):
its be 12
OpenStudy (anonymous):
|dw:1343008341029:dw|
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