anonymous
  • anonymous
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 .
Mathematics
jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
12 marbles altogether
amistre64
  • amistre64
slow computer today....
anonymous
  • anonymous
these are the answers i got do you know if they are right? a) with 343/1728 without 21/132

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anonymous
  • anonymous
b)with 125/1728 with out 60/132
anonymous
  • anonymous
c) I did not know how to do d) with 175/1728 without 14/132
amistre64
  • amistre64
with replacement should be: 12! --- or some such formula... 7!
anonymous
  • anonymous
i think its 7/12*7/12*7/12

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