Asked by Ande2
                In how many ways can 5 boys and 4 girls be arranged on a bench if 
(a) a boy and a girl wish to stay together
(b) 2 boys wish to stay together
(c) 2 girls wish to stay together
            
            
        (a) a boy and a girl wish to stay together
(b) 2 boys wish to stay together
(c) 2 girls wish to stay together
Answers
                    Answered by
            oobleck
            
    you just need to think on these a bit.
a boy and a girl can be chosen in 5*4=20 ways
Once chosen, they count as a single person with 7 others, so there are 20*7! ways to arrange them
now use the same logic, deciding how many ways 2 boys/girls can be chosen (order matters!)
    
a boy and a girl can be chosen in 5*4=20 ways
Once chosen, they count as a single person with 7 others, so there are 20*7! ways to arrange them
now use the same logic, deciding how many ways 2 boys/girls can be chosen (order matters!)
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