Get Started With Combinatorics 3 – Parade

Alice gets tired of standing in lines and heads off to her job as a parade coordinator for the US Navy. Her boss insists that she finish planning the parade by this afternoon. "After all," he says, "there are only 7 participants in this parade. How many options are there, really?"

How many possible orderings of the 7 parade participants should Alice consider if she wants to examine them all?

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