if two balls are drawn without replacement from a box containing 3 red balls 2 black balls and 1 green ball what is the probability of getting 2 red balls?
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OpenStudy (anonymous):
@Mertsj @zairhenrique help!!
OpenStudy (mertsj):
How many balls are in the box?
OpenStudy (anonymous):
6
OpenStudy (mertsj):
How many are red?
OpenStudy (anonymous):
3
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OpenStudy (mertsj):
What is the probability you will draw out a red ball on your first try?
OpenStudy (anonymous):
3/6?
OpenStudy (mertsj):
So you draw out a red ball and you don't put it back. How many balls are in the box now?
OpenStudy (anonymous):
5
OpenStudy (mertsj):
How many of them are red?
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OpenStudy (anonymous):
1
OpenStudy (mertsj):
How many red balls did you start out with?
OpenStudy (anonymous):
2
OpenStudy (mertsj):
box containing 3 red balls
How many red balls did you start out with?
OpenStudy (anonymous):
3
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OpenStudy (mertsj):
How many did you draw out on the first draw?
OpenStudy (anonymous):
3
OpenStudy (mertsj):
I don't know what to say to help you. There were 3 red balls in the box. You drew out 1 red ball on the first draw. 3-1 = 2. There are now 2 red balls remaining in the box which now contains 5 balls because you drew out 1 ball.
OpenStudy (anonymous):
so 1/5
OpenStudy (mertsj):
There are now 2 red balls in the box.
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