The one special couple consists of two people, so there are 10 others. The couple can be seated in 2! ways, and the remaining 10 (not 11) people can be seated in 10! ways.
The one special couple consists of two people, so there are 10 others. The couple can be seated in 2! ways, and the remaining 10 (not 11) people can be seated in 10! ways.
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