Selby Gardens sells bonsai trees. Customers can choose a juniper, maple, fir, or boxwood bonsai tree. Customers can also choose a circular, oval, or square base in which to plant the tree. The Chens are going to select one of the bonsai trees and one of the bases at random.

(a) Determine the number of sample points in the sample space. 

(b) Construct a tree diagram and list the sample space. 

Determine the probability that they select

(c) The juniper tree.

(d) The maple tree and the square base.

(e) A tree other than the boxwood.

Use the counting principle to determine the answer to part (a). Assume that each event is equally likely to occur.