20. How many ways can we select three door prizes from ten different ones (meaning each prize is unique) and distribute them among three people?

Simon Vane asked Sep 19, 2023

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Simon Vane asked Sep 19, 2023

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26 votes

Selecting three door prizes from ten different ones, we have

$P^(10)_3=\text{ }(10!)/((10-3)!)=(10!)/(7!)=(10*9*8*7!)/(7!)=720$

Akronix answered Sep 26, 2023

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