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Mathematics
Problem
A bag contains 4 red, 3 green and 2 blue balls. Two balls are drawn one after another without replacement. What is the probability that the two balls are of different colours? a)
52
81
\dfrac{52}{81}
81
52
b)
13
18
\dfrac{13}{18}
18
13
c)
5
18
\dfrac{5}{18}
18
5
d)
3
4
\dfrac{3}{4}
4
3
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