While sitting on a park bench, Tanisha counts that 16 out of 20 people who walk by her have a pet with them. Part A. What is the probability that a person who walks by Tanisha has a pet?

Part B. What is the probability that a person who walks by her does not have a pet?​

The question is asking how many ways can ten team be randomly assigned to 5 games. They can be randomly assigned in nPrC 
r = n!/( n-r)! ways. 
 So we have that 10 teams can be randomly assigned to five games in 10C5 ways. 
 10C5 = 10!/ (10-5)! = 10!/ 5! = 30240 ways. So they can be arranged in 30240 ways.