概率达人请入内观看小弟感激不尽suppose there are four families each with parents and son.they are to be seated in a row of 12 seats from left to right.how many different ways can they be seated,if each family is to be seated together.

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概率达人请入内观看 小弟感激不尽suppose there are four families each with parents and son.they are to be seated in a row of 12 seats from left to right.how many different ways can they be seated,if each family is to be seated together.