There are four balls of different colours and four boxes of colours, same as those of the balls.... VIDEO
There are four balls of different colours and four boxes of colours, same as those of the balls. Thenumber of ways in which the balls, one each in a box, could be placed such that a ball does not go to a box of its own colourhttps://bit.ly/YTAI_PWAP https://www.pw.live
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