Question 32
A Vitas word is a string of letters that satisfies the following conditions:
- It consists of only the letters $B$, $L$, $R$.
- It begins with a $B$ and ends in an $L$.
- No two consecutive letters are the same.
How many Vitas words are there with $11$ letters?
- It consists of only the letters $B$, $L$, $R$.
- It begins with a $B$ and ends in an $L$.
- No two consecutive letters are the same.
How many Vitas words are there with $11$ letters?