Question 5
Beaver words obey these rules:
- They use only these three symbols.
- Reading left to right or right to left gives the same word. Examples:
- A word’s length is its number of symbols. This word has length 3:
How many words of length 3 can be formed?
- They use only these three symbols.
- Reading left to right or right to left gives the same word. Examples:
- A word’s length is its number of symbols. This word has length 3:
How many words of length 3 can be formed?