1.Read the information given below and answer the questions given after that.

ABC Co decided to have a quality check on its production before the supply is sent to the customers. The system applied is: A set of 20 articles is manufactured and 4 of them are chosen at random. If any one of them is found to be defective then the whole set is put under 100% screening again. If no
defectives are found, the whole set is sent to the customers.


Q. Find the probability that a container having only one defective article will be sent back for screening?