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Are you serious? If it's a 50-50 game then EV = 0 no matter what "strategy" you use.

Plus, there's usually a "cap" on how much you can bet on one hand.

Even if there's no cap, the house probably has you covered.

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Well, prove it to me. i agree if you bet 100dollar each time, then the EV will be 0. but not when you DOUBLE the bet each time you lose.