SOLUTION: how many ways can 4 boys and 3 girls be sitted in a roll of 7 seats if they can sit anywhere b. if the boys and girls must alternate

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Question 1039938: how many ways can 4 boys and 3 girls be sitted in a roll of 7 seats if they can sit anywhere
b. if the boys and girls must alternate

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The next seat can be any of the boys or
any of the girls, so there are
+7%21+=+5040+ ways they can be seated
(b)
The boys will have to be in positions
1,3,5, and 7
The girls have to be in positions
2,4, and 6
There are +4%21%2A3%21+=+144+ ways
for them to be seated