what is the probability?

Question

In a shipment of 8 small motors, 2 are known to be defective . Suppose that one motor is removed from the shipment and found to be defective . If another motor is randomly selected, what is the probability it is working correctly?

Answer 1

If a defective motor is removed, then of the 7 left, only 1 will be defective.

So a random selection has a Probability of working of 6/7 = 0.857