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Sakal is attempting to score a goal in FIFA 19. On his first attempt, he has a $30\%$ chance of success. Sakal’s likelihood of success improves by $5\%$ after each failed attempt. For example, his second attempt has a $35\%$ chance of success if he fails on the first attempt. What is the minimum number of his attempt to guarantee a goal?


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First Solve @Abdullahil

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