Thread: Combination Problem

At a burger specialty restaurant, the toppings options are catsup, mayonnaise, mustard, tomatoes, onions, lettuce, mushrooms,Swiss cheese, cheddar cheese, steak sauce, and guacamole. If you can choose between a 4-oz burger or a 6 oz burger and want a mix of 4 toppings, how many different burgers can you order ?

Thank you.

Sahip

If is the number of toppings and is the number of sizes then your answer is: