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In how many ways can 4 women draw water from 4 taps, if no tap remains unused?

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In how many ways can 4 women draw water from 4 taps, if no tap remains unused?
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Correct Answer - 24
1st tap can be used by any of the 4 women in 4 ways.
2nd tap can be used by any of the remaining 3 women.
3rd tap can be used by any of the remaining 2 women.
4th tap can be used by the remaining 1 woman.
Required number of ways `=4xx3xx2xx1=24.`
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