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प्रश्न
In how many ways 4 women draw water from 4 taps, if no tap remains unused?
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उत्तर
Number of ways to draw water from the 1st tap = Number of women available to draw water = 4
Number of ways to draw water from the 2nd tap = Number of women available to draw water = 3
Number of ways to draw water from the 3rd tap = Number of women available to draw water = 2
Number of ways to draw water from the 4th tap = Number of women available to draw water = 1
∴ Total number of ways = `4xx3xx2xx1=`\[\times\]1 = 4! = 24
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