SOLUTION: How many ways 5 boys and 10 girls can sit in a row, if two particular boys and also two particular girls must not sit together? Please help...

Question 461379: How many ways 5 boys and 10 girls can sit in a row, if two particular boys and also two particular girls must not sit together?
Please help...

Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!
Assume that two particular boys as a single boy and also two girls as a single girl.
so, 4 boys and 9 girls, two boys can also arrange by 2! ways , similarly two girls can also arrange by 2! ways.

number of ways when they are together = 13! *2*2

number of ways when there is no restriction = 15!

required number of ways when they are not together = 15! - 13! * 2*2

Everyone is welcome to get free help online: sudhanshu.cochin@gmail.com
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