in how many ways can 3 girls and 9 boys be seated in two vans, each having numbered seats,3 in the front and 4 at back ?how many sitting arrangements are possible if 3 girls should sit together in the back row on adjacent seats?
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https://www.meritnation.com/ask-answer/question/in-how-many-ways-2-girls-and-3-boys-can-be-seated-in-two-car/permutations-and-combinations/9740577
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