1.

Three person A,B,C invite 2n guest to a party. All the people sit around a round table such A,B,C have their fixed seats (there is a least one seat between any two fixed seats)a and two particulars guests doesn't sit together. Find the number of ways is whcih they can be seated.

Answer»


ANSWER :`(4N^(2)-6n+6)(2n-2)!`


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