There are 7 streets to be named after 7 tree types. Ash, Cedar, Elm, Fir, Maple, Spruce, and Willow. A city planner randomly selects the street names from the list of 7 tree types. Compute the probability of each of the following events. Event A: The first three streets are Ash, Spruce, and Willow, without regard to order. Event B: The first street is Willow, followed by Ash and then Spruce. Write your answers as fractions in simplest form. P (4) = 1 P (B) = 0 X 2