Question: A production company produces DVD's by the thousands. However, sometimes there are minor defects in the DVD's that make them "faulty" by industry standards. For one company, they estimate that 3% of their DVD's are defective, and must be exchanged/returned for refund by the customer. BestBuy purchases DVD's from this company, which is where you usually shop. Suppose you buy 20 DVD's.

A. What is the probability that exactly one of the CD's is defective?

B. What is the probability that at least one of the CD's is defective?

C. What is the probability all of the CD's are in good condition (not defective)?