In order to be accepted, you have to choose no defects out of the batch.2. A batch of fifty items is inspected by testing three items selected without replacement. If one of the three is defective, the batch is rejected. What is the probability that the batch is accepted if it contains fi ve defectives?

There are 45 good ones and 5 rejects. So, you have to choose 3 from the 45 good ones and 0 from the 5 bad ones.