Combination Calculator. In finite mathematics a combination is most typically calculated using the formula C(n,r) = n!/r!(n-r)!. In this formula n represents the total number of items and r represents the number of items to choose. The formula is modified depending on the importance of item order and repeating items in the set of allowed results.
You won't use 22 toppings on any burger. How many toppings will you use on any one burger (r)?
This might also help you.
5! = 5 * 4 * 3 * 2 * 1
If I have 22 toppings available for a burger, how many combinations are possible
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