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A pizza parlor offers six toppings. What is the greatest number of four-topping pizzas that can be made such that no two pizzas have the same topping combination? (All four toppings must be different.)

 May 22, 2023
 #1
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The answer is P(6,4) = 6!/2! = 30.

 May 22, 2023
 #2
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Incorrect, the answer is 6 choose 4 which is 15.

 May 22, 2023

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