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There are 21 students participating in a mathematics competition. How many ways can the students who go first and second be chosen?

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DarrylChandra

[tex] {21}^{2} \times 2 = 882 \\ so \: there \: are \: 882 \: ways[/tex]
do you understand? sorry if my english is bad i am Indonesian please corect me if i do some false

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