Question 1163352: A pizza restaurant offers 6 toppings to choose from for their pizzas, and no toppings is considered a plain cheese pizza. How many different pizzas topping combinations are possible if the maximum number of allowed toppings is 3 and toppings can’t repeat? (hint - consider all no additional toppings, 1,2,3 additional toppings)
I have tried to do C(6,3) and I got 20 but it wasn't correct when checked.
Answer by greenestamps(13209)   (Show Source):
You can put this solution on YOUR website!
C(6,3) is the number of ways of choosing 3 of the 6 toppings.
3 is only the MAXIMUM allowed number of toppings; you can also have 2, or 1, or 0 toppings. So the answer is
C(6,3)+C(6,2)+C(6,1)+C(6,0)
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