Tree Diagrams sequential in nature

Tree Diagrams
A tree diagram is a visual way of representing
the probabilities of experiments that are
sequential in nature
I have a sock drawer with 4 Navy socks and 8
Brown socks. It is a dark winter morning. I draw
2 socks at random from the drawer.
Two ways to do this:
 with replacement
 without replacement
What is the probability of drawing:
1. two Brown socks?
2. mismatched socks?
3. a Navy sock on the 2nd draw?
4. another Navy sock if I already drew a Navy
sock on the 1st draw?