An urn contains 6 balls of which two are red and four are black. Two balls are drawn at random. Probability that they are of the different colours is
An urn contains 6 balls of which two are red and four are black. Two balls are drawn at random. Probability that they are of the different colours is
A. `(2)/(5)`
B. `(1)/(15)`
C. `(8)/(15)`
D. `(4)/(15)`
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