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Question
In how many ways can 4 married couples seat themselves around a circular table, if atleast one husband sits beside his wife.
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Answer
2880. Selecting any couple out of 4 is 4 ways and then rearranging all others is 6! ways. This 6! includes 1 couple stay together, 2couple stay together and 3 couple stay together. so 4*6! ways.
