56 lines
1.4 KiB
Markdown
56 lines
1.4 KiB
Markdown
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---
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id: 5900f4771000cf542c50ff8a
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challengeType: 5
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title: 'Problem 267: Billionaire'
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videoUrl: ''
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localeTitle: 问题267：亿万富翁
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---
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## Description
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<section id="description">您将获得独特的投资机会。从1英镑的资本开始，你可以选择固定比例f来投注一个公平的硬币投掷1000次投掷。你的回报是对你的投注加倍，你失去了对尾巴的赌注。例如，如果f = 1/4，对于第一次投掷，你下注0.25英镑，如果头部出现你赢得0.5英镑，那么就有1.5英镑。然后你下注0.375英镑，如果第二次折腾是尾巴，你有1.125英镑。选择f以最大限度地提高在1,000次翻转后获得至少1,000,000,000英镑的机会，您成为亿万富翁的机会是多少？假设所有计算都是精确的（没有舍入），但是将答案四舍五入到小数点后面的12位数，形式为0.abcdefghijkl。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler267()</code>应返回0.999992836187。
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testString: 'assert.strictEqual(euler267(), 0.999992836187, "<code>euler267()</code> should return 0.999992836187.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler267() {
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// Good luck!
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return true;
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}
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euler267();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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