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Three squares of Chess board are selected at random. Find the probability of getting 2 squares of one colour and other of a different colour.

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Chessboard=64
Possible ways=`.^4C_3`
Favorable ways=2 Black
`=.^32C_2*.^32C_1+.^32C_2*.^32C_1`
`=2*.^32C_2*.^32C_1`
Probability=Favourable/possible
`=(2*.^32C_2*.^32C_1)/(.^64C_3)`
`=16/21`.

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