1. Suppose that 4 items are selected at random from manufacturing process. Each item is inspected and classified defective (D) or non-defective (N).
a. List the elements of the sample space
b. List of the following event:
A = event of having at least two defective
B = event of obtaining one defective and three non-defective
C = event of obtaining three defective and two non-defective
D = complement of event A