56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			56 lines
		
	
	
		
			1.4 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
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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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| 
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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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| 
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| ## Instructions
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| <section id="instructions">
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| </section>
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| 
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| ## Tests
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| <section id='tests'>
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| 
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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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| ```
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| 
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| </section>
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| 
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| ## Challenge Seed
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| <section id='challengeSeed'>
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| 
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| <div id='js-seed'>
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| 
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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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| 
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| euler267();
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| 
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| ```
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| 
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| </div>
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| 
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| 
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| 
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| </section>
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| 
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| ## Solution
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| <section id='solution'>
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| 
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| ```js
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| // solution required
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| ```
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| </section>
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