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Problem
A bag contains 4 white and 6 black balls. Three balls are drawn successively without replacement. What is the probability that the three balls drawn are not all of the same colour? a)
1
5
\dfrac{1}{5}
5
1
b)
5
6
\dfrac{5}{6}
6
5
c)
4
5
\dfrac{4}{5}
5
4
d)
2
5
\dfrac{2}{5}
5
2
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