Assume a jar has 7 red marbles and 5 black marbles. Draw out 3 marbles with and without replacement. Find the requested probabilities.
(a) P(3 red marbles)
With replacement , without replacement .
(b) P(3 black marbles)
With replacement , without replacement .
(c) P(one red and two black marbles)
With replacement , without replacement .
(d) P(red on the first draw and black on the second draw and black on the third draw)
With replacement , without replacement .

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a) with replacement:
P(3 red) = P(1st red). P(2nd red). P(3rd red)=(7/10)(7/10)(7/10)=343/1000

wouldnt it be 7/12? not 7/10?

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