Problem
Problem of the Day #93
POTD March 11, 2024
Starting with an empty string, we create a string by repeatedly appending one of the letters A, B, C with probabilities \frac{1}{4}, \frac{1}{2}, \frac{1}{4}, respectively, until the letter B appears twice consecutively. What is the expected value of the length of the resulting string?
Want to contribute problems and receive full credit? Click here to add your problem!
Please report any issues to us in our Discord server
Problem feedback
Difficulty
—