Question 580993: Hi there, please help:)
Consider a box which has 7 red balls and 4 green balls:
a. Find the probability of drawing a red ball on the first draw and a green ball on the second draw, if you do not return the first ball to the box.
b. Find the probability of drawing a green ball on the first draw and a green ball on the second draw, if you do return the first ball to the box.
Thanks,
Fiona
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Consider a box which has 7 red balls and 4 green balls:
a. Find the probability of drawing a red ball on the first draw and a green ball on the second draw, if you do not return the first ball to the box.
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P(green | red) = (7/11)(4/10) = 14/55
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b. Find the probability of drawing a green ball on the first draw and a green ball on the second draw, if you do return the first ball to the box.
P(green | green) = (4/11)^2 = 16/121
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Cheers,
Stan H.
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