12.Rock, Paper, No Rock
★★★expected valueJane Street
You play rock-paper-scissors against an opponent who is forbidden from playing rock, and the loser of each round pays the winner (a draw pays nothing). With both sides playing optimally, what is your expected profit per round?
Sign in to submit an answer and track it toward your stats.
Sign inHint
Your opponent has only two options, so one of your three plays is dominated. Find the mix that makes your two surviving plays equally attractive.
Want timed drills, mental math, and a market-making game too? Try the full practice suite →