A room consists of 7 women and 5 men.A five-member group needs to make a presentation. How many ways can this be done if

1. the group must contain no men?ways

2. the group must contain one man?ways

3. the group must contain two men?ways

4. the group must contain three men?ways

5. the group must contain four men?ways

6. the group must contain 5 men?ways

7. How many 5-members groups are possible?ways