Determine whether each of the following counting problems


Determine whether each of the following counting problems can be solved by using permutations or combinations, and answer each question.

The command structure on a space shuttle flight is determined by the order in which astronauts are selected for a flight. How many different command structures are possible if 8 astronauts are selected from the 20 that are available?

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Basic Computer Science: Determine whether each of the following counting problems
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