There are $10$ students in the class. Four of these students will be selected randomly to participate in the math contest. Then, how many different sequences can four students be selected? I thought that I can use $^{10}P_4$, but it gave me the wrong answer. Can someone guide me though this problem? Thanks for answering!
2026-04-11 21:16:15.1775942175
How many different sequences in this event?
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