A bag contains 9 identical balls, of which are 4 are blue and 6 are green. Three balls are taken out randomly from the bag after one another. Find the probability that all three balls are blue?

A bag contains 9 identical balls, of which are 4 are blue and 6 are gr

1.	A bag contains 9 identical balls, of which are 4 are blue and 6 are green. Three balls are taken out randomly from the bag after one another. Find the probability that all three balls are blue?
A.	( frac {5}{8} )
B.	( frac {6}{19} )
C.	( frac {5}{21} )
D.	( frac {4}{7} )
Answer» D. ( frac {4}{7} )

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A bag contains 9 identical balls, of which are 4 are blue and 6 are green. Three balls are taken out randomly from the bag after one another. Find the probability that all three balls are blue?

A bag contains 9 identical balls, of which are 4 are blue and 6 are green. Three balls are taken out randomly from the bag after one another. Find the probability that all three balls are blue?

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