Question
Find the number of ternary words that have:Length at most $n$
Step 1
There are 3 possibilities: 0, 1, or 2. Now, consider the number of ternary words of length 2. There are 3 possibilities for the first digit and 3 possibilities for the second digit, giving us a total of 3 * 3 = 9 possibilities. Similarly, for length 3, there are Show more…
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