Question is as follows:

"A bin of 50 parts contains 5 that are defective. A sample of 10 parts are selected at random, without replacement. Compute the probability that a sample contains at least four defective parts."

The example the professor showed in class involved "at least one defective part", and to solve she simply subtracted the number of combinations without any defects from the total number of combinations. So I'm struggling to figure this one out since we're looking for the probability the sample will have at least 4.