Problema Solution
A restaurant has 7 pizza toppings to choose from. How many different 2 topping pizzas are possible?
Answer provided by our tutors
We are dealing with 2-combinations of a set with 7 elements:
C(7, 2) = 7!/(2!(7 - 2)!)
C(7, 2) = 7!/(2!5!)
C(7, 2) = 6*7/2
C(7, 2) = 21
21 different 2 topping pizzas are possible.