In how many ways 8 persons can be seated...

In how many ways 8 persons can be seated on a round table
(a) If two of them (say A and B) must not sit in adjacent seats.
(b) If 4 of the persons are men and 4 ladies and if no two men are to be in adjacent seats.
(c) If 8 persons constitute 4 married couples and if no husband and wife, as well as no two men, are to be in adjacent seats?

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