You have 30 friends that you want to invite to dinner. However, your dining room table only seats 6 people. Since you will take up one seat, you can only have five friends at one time. You figure out that if you have a dinner party every Saturday night for 6 weeks, you can have everyone over. Now you have to decide how to form you Saturday night groups. How many different groups of guests can you have? (Psychology, Elementary Statistical Reasoning)

Q1: Is this an example of a combination or a permutation? 

Q2: What is N? 

Q3: What is r? 

Q4: What is the calculated value for this example?