Twenty air-conditioning units have been brought in for service. Twelve of them have broken compressors, and eight have broken fans. Seven units are chosen at random to be worked on. What is the probability that three of them have broken fans?

Answer :

Step 1 of 2 :

Given,

We have, the number of air-conditioning units have been brought in for service = 20

The number of broken compressors = 12

The number of broken fans = 8

The number of units are chosen at random to be worked on = 7

The claim is to find the probability that three of them have broken fans.