In how many way 8 can be seated in a round table if two of them (say A and B) must not sit together.
1) total minus when AB sit together .
7! - 6! * 2
2) selecting one from A and B and arranging it with other 6 person . Then arranging the one person left in 4 seats available (not adjacent) .
Which method is correct and why the other one is wrong