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Q.

In a circus there are ten cages for accommodating ten animals.  Out of these four cages are so small that five out of 10 animals cannot enter  into them. In how many ways will it is possible to accommodate ten animals in these cages

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answer is 86400.

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Detailed Solution

At first we have to accommodate those 5 animals in cages which can not enter in 4 small cages, therefore number of ways are P5   6 . Now after accommodating 5animals we left with 5 cages and 5 animals, therefore number of ways are 5 !. Hence required number of ways =P5   6×5!=86400
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