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Circular Permutation

The number of...

Question

The number of ways in which 6 boys and 6 girls are arranged in a row so that no two boys sit together and always row start with the boy is

A

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B

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C

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D

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Solution

The correct option is A
$B_{1} G_{1} B_{2} G_{2} B_{3} G_{3} B_{4} G_{4} B_{5} G_{5} B_{6} G_{6} = 6! 6!$

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