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     EduGorilla 
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    There are four balls of different colours and four boxes of different colours, same as those of the balls. The number 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 colour is

    Options :-

    1. 9
    2. 24
    3. 12
    4. 16
    5. none of these
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