A hot dog stand sells hot dogs with cheese, relish, chili, tomato, onion, mustard, or ketchup. How many different hot dogs can be concocted using any 5 of the extras?
You can obtain your answer by using a scientific calculator in order to get the nCr of the problem above. Since you have seven choices and they use 5 in extras. Using the calculator, you have to solve by: 7 nCr 5 The nCr is a function in the calculator that will help you obtain your answer. The answer of that would be 21.
