Question

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

Answer 1

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

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

Since the first letter is K or W:

`17550*2=35100`