2018-10-10 18:03:03 -04:00
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---
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id: 5900f48a1000cf542c50ff9d
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challengeType: 5
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videoUrl: ''
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2020-10-01 17:54:21 +02:00
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title: 问题286:计分概率
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2018-10-10 18:03:03 -04:00
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---
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## Description
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2020-02-18 01:40:55 +09:00
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<section id="description">
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447/5000
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芭芭拉(Barbara)是数学家和篮球运动员。 她发现从距离x射击时给一个点评分的概率正好是(1 -x / q),其中q是大于50的实常数。
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在每次练习中,她从x = 1,x = 2,...,x = 50的距离射击,并且根据她的记录,她恰好有2%的机会总得分为20分。
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找出q并将答案四舍五入到小数点后十位。
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</section>
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2018-10-10 18:03:03 -04:00
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## Instructions
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2020-02-18 01:40:55 +09:00
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<section id="instructions">
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</section>
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2018-10-10 18:03:03 -04:00
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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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2020-02-18 01:40:55 +09:00
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- text: <code>euler286()</code>应该返回52.6494571953。
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testString: assert.strictEqual(euler286(), 52.6494571953);
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2018-10-10 18:03:03 -04:00
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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 euler286() {
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// Good luck!
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return true;
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}
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euler286();
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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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2020-08-13 17:24:35 +02:00
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/section>
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