2013 SRJC P2 Q6

Mr Ahmad, Miss Banu and the families of Lim and Tan were invited to a wedding banquet. The Lim family consists of a man and both his parents while the Tan family consists of a woman and both her parents. The invited guests sit at a round table for eight. Find the number of ways of arranging the eight people if

1. there are no restrictions; [1]
2. the men and women are seated alternately; [2]
3. Mr Ahmad and Miss Banu sit separately, and the members of the same family are seated together;[3]
4. the members of the same family are seated together and the seats are numbered. [3]