The probability of accepting the shipment is ?

Suppose you have just received a shipment of 28 modems. Although you don't know this, 6 of the modems are defective. To determine y whether you will accept the shipment, you randomly select 7 modems and test them. If all 7 modems work, you accept the shipment. , Otherwise, the shipment is rejected. What is the probability of accepting the shipment? ' -E>