Question: 1) In how many different ways can 19 people be seated in a row?
2) In how many different ways can 11 men and 8 women be seated in a row?
3) In how many different ways can 11 men and 8 women be seated in a row if the men all sit together and the women all sit together?
4) In how many different ways can 11 men and 8 women be seated in a row if no 2 women are to sit together?