A release-checked easy problem for training Law of Total Probability, Coins, Conditional Probability.
Question
$n \geq 2$ people labelled $1-n$ play a game where player $1$ starts with a coin that has probability $0 < p < 1$ of showing heads per flip. The first player to flip a head wins. If player $i$ lands a tails, then they pass the coin to player $i+1$ for their turn to flip. Once the coin reaches player $n$, the coin circles back around to the start for player $1$ to flip again, and the cycle repeats. Find the probability that player $1$ wins when $n = 5$ and $p = 1/3$.
Practice focus
This Probability problem is tagged Law of Total Probability, Coins, Conditional Probability. State the random variables and conditioning information explicitly, then check the result against boundary cases before opening hints or a solution.