Morse code 2

We have two characters: a dot and a comma.

How many two-character and three-character sequences can be created using them, with repetition allowed?

Final Answer:

n₂ =  4
n₃ =  8

Step-by-step explanation:

$$\begin{gathered} a=1+1=2 \\ {n}_2=a^2=2^2=4 \end{gathered}$$

$n_3=a^3=2^3=8$

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