A : the number of ways in which 5 boy...

A : the number of ways in which 5 boys and 5 girls can sit in a row so that the boys and girls sit alternatively is 28800 .
R : the number of ways in which n ( first type of differernt ) things and n ( second type of different ) things cna be arranged in a row alternatively is `2 xx n! xx n! `,

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