Combinatorics

Permutation concerns itself with number of __________.

• counting techniques

• selections

• arrangements

• events

Combination concerns itself with the number of _______.

• counting techniques

• selections

• arrangements

• events

What is 3 factorial equal to?

In the set {1,2,3}, how many permutations are there when taken one at a time?

• 3

• 6

• 9

• 12

True or False : 3! = 3! x 2! x 1!

• True

• False

Permutation or Combination: The student body of 30 students wants to elect a president, vice president, secretary, and treasurer.

• permutation

• combination

Permutation or Combination: A group of 40 people are going to run a race. The top three runners earn gold, silver, and bronze medals.

• permutation

• combination

How would you solve?
A book club offers a choice of 8 books from a list of 40.  In how many ways can a member make a collection?

• Permutation
• Combination
• Factorial
• MPC

How would you solve?
From the 20 DVD's you purchased this past year, you plan to take five with you on vacation.  How many different sets of five DVD's can you take?

• Permutation
• Combination
• Factorial
• MPC

Permutation or Combination: A group of 14 people need to take an elevator to the top floor. They will go in groups of seven. They are deciding who will take the elevator on its second trip.

• permutation

• combination