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Question

Find the number of ways in which 5 boys and 4 girls can be arrange on a circular table such that no two girls sit together and two particular boys are always together.

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Solution

2 particular boys always together.take them as a unit.Now 1 unit +3 Boys can be count as 4 persons
4 boy can be arranged in (41)!

=3! ways

Those two boys can be interchanged
=6×2=12

4 girls in 4 places=4! ways
12×4×3×2=12×12×2=144×2

=288 ways
1122299_1037233_ans_44b73e9b1e614943aff9a020c9f9e30a.png

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