Winning of game

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Given a game, where we pay x dollars (say 10 dollars), if we loss, we will loss 100% (we loss 10 dollars), if we win we got 37.5% (we win 3.75 dollars). Given a strategy with 70% winning percentage. Is anyway we place our bid that is able to win the game?

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Omitting units, you pay $x$. You expect to receive back $(0.7)1.375x = 0.9625x < x$.

Since you expect to get back less than you pay, no: You should not play using the 70% strategy.