There are 3 women (A, B, C) and 3 men (D, E, F). How many ways can the 6 of them line up such that:

1.) No restrictions apply?

2.) Men and women have to alternate?

3.) First and last person in the line are women?

4.) A and D will not stand next to each other?

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I'm not sure how to go about these counting questions.

For #1, I believe it'd just be 6!, right?