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it's the question of math&stat, the way I think is 12! (no restrictions) - the permutations that 2 girls sitting together. But there are repeated cases, and i've puzzled and I realized that there're many experts here, so I hope my problem can be solved, thanks.

the answer is 3XXXXXXX

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    Could you say a little about the context of this question? How do you know the first digit?2012-12-16
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    it's the hint..2012-12-16
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    Welcome to math.SE: since you are new, I wanted to let you know a few things about the site. In order to get the best possible answers, it is helpful if you say in what context you encountered the problem, and what your thoughts on it are; this will prevent people from telling you things you already know, and help them give their answers at the right level.2012-12-16
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    Thank you. :) i understood.2012-12-16

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