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In how many ways three girls and nine bo...

In how many ways three girls and nine boys can be seated in two vans, each having numbered seats, 3 in the front and 4 at the back? How many seating arrangements are possible if 3 girls sit together in a back row on adjacent seats?

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We have 14 seats in two vans. And there are 9 boys and 3 girls.
The number of ways of arranging 12 people on 14 seats without restriction is `(^14P_(12))​=(14!)/(12!)​=7(13!)`
Now the number of ways of choosing back seats is 2.
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