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Tino's Ice Cream Shoppe features seven flavors: vanilla, chocolate, pistachio, coconut, blackberry, lemon, and saffron. Tino will gladly make you an ice cream shake featuring any two scoops you want (not necessarily of different flavors). For example, you can order blackberry-vanilla, or pistachio-saffron, or even chocolate-chocolate. Since the scoops are just going into the blender anyway, the order of the scoops doesn't matter: there's no difference between blackberry-vanilla and vanilla-blackberry.

How many different shakes can you order?

 May 10, 2019
 #1
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We can choose any 2 of the 7  plus  7 "doubles"  [ chocolate-chocolate, etc. ] 

 

So

 

C(7, 2)  +  7  =

 

28 different shakes

 

cool cool cool

 May 10, 2019

7 Online Users

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