a) \(\frac {5}{8}\)
b) \(\frac {6}{19}\)
c) \(\frac {5}{21}\)
d) \(\frac {4}{7}\)
A bag contains 9 identical balls, of which are 4 are blue and 6 are green. Three balls are taken out randomly from the b
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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 b
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