4 boys and 4 girls are to seated in arow i)no. of girls sit togetherii)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 togetherv)in how many ways 4 boys and 4 girls can be seated in alternate arrangement mannerSolution:)1.^{5}P_{5}*^{4}P_{4}2.^{8}P_{8}-^{5}P_{5}*^{4}P_{4}3.2*^{4}P_{4}*^{4}P_{4}