DannielaH120366 DannielaH120366

29-10-2022
Mathematics

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How many different station call letters can be made if repetition is not allowed?

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JaceyZ188864 JaceyZ188864

29-10-2022

Since repetition is not allowed, we need to use a permutation:

[tex]\begin{gathered} P=(n,r)=\frac{n!}{(n-r)!} \\ P=(27,3)=\frac{27!}{(24)!}=17550 \\ \end{gathered}[/tex]

Since the first letter is K or W:

[tex]17550\times2=35100[/tex]

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