A lot of 2500 electronic chips contains 50 that are defective. Two chips are selected at random, without replacement from the lot. 1. What is the probability that the first

one selected is defective? 2. What is the probability that the second one selected is defective given that the first one was defective? (5 points) 3. What is the probability that they both are defective? 4. What is the probability that the second one is not defective given that the first one is?