Question:
A turn consists of rolling a standard die and tossing a fair coin. The game is won when the die shows a 1 or a 6 and the coin shows heads. What is the probability the game will be won before the fourth turn? Express your answer as a common fraction.

Answer:
The probability of rolling 1 or 6 is $\frac{2}{6}$, and the probability of flipping heads is $\frac{1}{2}$.  Therefore, the probability that the game will end on the first turn is $\frac{2}{6}\cdot \frac{1}{2}=\frac{1}{6}$.  The probability that the game will not end on the first turn is $1-\frac{1}{6}=\frac{5}{6}$.  Given that the game is still going after 1 turn, the probability that the game will not end on the second turn is also $\frac{5}{6}$.  Therefore, the probability that the game does not end by the end of the second turn is $\left(\frac{5}{6}\right)^2$.  Similarly, the probability that the game is still going after 3 turns is $\left(\frac{5}{6}\right)^3=\frac{125}{216}$.  So the probability that the game is over by the end of the third turn is $1-\dfrac{125}{216}=\boxed{\dfrac{91}{216}}$.