12 persons are to be arranged to a round table. If two particular persons among them are not to be side by side, the total number of arrangements is?
Correct Answer: 9 (10!)
Explanation:
12 persons can be seated around a round table in 11! ways. The total number of ways in which 2 particular persons sit side by side = 10! x 2!. Hence, the required number of arrangements = 11! - 10! x 2! = 9 x (10!)
