I'm giving away $300,000 USD to whoever solves a math puzzle first. The most efficient way to solve it is through random guessing. Oh, and the game resets ever

I'm giving away $300,000 USD to whoever solves a math puzzle first. The most efficient way to solve it is through random guessing. Oh, and the game resets every 10 minutes, where I'll give away the same prize again. For 4 years total, then I half the prize. Go.