Kindergarten class has 7 Scooby Doo , 8 Sesame Street, and 9 Barney DVDs. Each week, the class randomly selects 2 DVDs to watch on Friday. What is the probability that both movies are Barney?

Question

Kindergarten class has 7 Scooby Doo , 8 Sesame Street, and 9 Barney DVDs.  Each week, the class randomly selects 2 DVDs to watch on Friday.  What is the probability that both movies are Barney?

Scott · Answer

there are 24C2 ways of selecting two movies there are 9C2 ways of selecting two Barney movies the probability is ... 9C2 / 24C2