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4 boys and 4 girls are to seated in arow
i)no. of girls sit together
ii)not all girls sit together
iii)boys and girls are altenate to each other
iv)if a particular boy and girl are a couple find no. of ways they are never together
v)in how many ways 4 boys and 4 girls can be seated in alternate arrangement manner
1.5P5*4P4
2.8P8-5P5*4P4
3.2*4P4*4P4
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