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In a class room there are 10 rows and in...

In a class room there are 10 rows and in each row there are 2 chairs. In how many ways 10 boys and 10 girls can be arranged in these 20 chairs so that in each row one girl and one boy must be seated

Text Solution

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The correct Answer is:
`2^(10)xx(lfloor10)^2`
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