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Problem
A box contains 2 red, 3 blue and 5 green balls. A ball is drawn and replaced. Two more balls are then drawn without further replacement. What is the probability that exactly two of the three balls drawn are blue? a)
7
40
\tfrac{7}{40}
40
7
b)
189
1000
\tfrac{189}{1000}
1000
189
c)
14
75
\tfrac{14}{75}
75
14
d)
7
50
\tfrac{7}{50}
50
7
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