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A pizza parlor has six different toppings. How many different one- and two-topping pizzas can you order?

 Feb 25, 2021
 #1
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6 choices for 1 topping

 

two toppings

a    b c d e f

b    c d e f

c    d e f

d    e f

e    f                       15 choices             6 + 15 = 21 different pizzas

 Feb 25, 2021
edited by ElectricPavlov  Feb 25, 2021
edited by ElectricPavlov  Feb 25, 2021
 #2
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thank you it right

Guest Feb 26, 2021

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