The question is in the screenshot below, please show your work. Thank you!

11:) Toss a fair coin (heads and tails equallyr likely]. Every thne it comes up heads, you 'Win a dollar, but the game is over as soon as it comes up tails. The expected payoff of the game is computed by summing all possible pagoffs times their respective probabilities. If the probability of tossing the rst tail on the n toss is ll)\