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Mathematics 9 Online
OpenStudy (dls):

There are two rows,one behind other,of 5 chairs each.Five couples are to be seated, number of arrangements such that no husband sits in front or behind his wife are?

OpenStudy (dls):

I got.. \[\LARGE (10!-(5! \times (2!)^5)\] don't know what's wrong here..:/

OpenStudy (dls):

|dw:1364109666850:dw|

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