There are streets to be named after tree types. Birch, Cedar, Elm, Fir, Maple, Oak, Pine, Spruce, and Willow.
A city planner randomly selects the street names from the list of tree types.
Compute the probability of each of the following events.

Event A: The first street is Willow, followed by Oak and then Maple.

Event B: The first three streets are Birch, Maple, and Pine, without regard to order.

Write your answers as fractions in the simplest form.