1. Choosing items from a larger group, when the order does not matter. This is different than permutations in chapter 11.2 – items had to be in a certain order. 11.3 Combinations

2. Combination formula n = size of the large group r = number of items chosen – not in any particular order From “n” items, choosing “r” at a time:

4. Using a Calculator for Combinations.

5. A pizza restaurant offers 14 different toppings for its pizzas. How many different 3-topping pizzas are possible?

6. The Prom committee will consist of 5 people. If there are 70 seniors, how many different committees are possible?

8. Permutation or Combination?????? If they have to be in order, use __permutation_______ If the order doesn’t matter, use __combination_________

9. Classwork Page 599-600, #1-10 (determine P or C) and #27-38 – calculate using Combination.