fix: replace .chinese.md extension with .md
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---
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id: 5900f45f1000cf542c50ff71
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challengeType: 5
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title: 'Problem 242: Odd Triplets'
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videoUrl: ''
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localeTitle: 问题242:奇数三胞胎
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---
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## Description
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<section id="description">给定集合{1,2,...,n},我们将f(n,k)定义为具有奇数元素之和的k元素子集的数量。例如,f(5,3)= 4,因为集合{1,2,3,4,5}有四个3元素子集具有奇数元素,即:{1,2,4},{ 1,3,5},{2,3,4}和{2,4,5}。 <p>当所有三个值n,k和f(n,k)都是奇数时,我们说它们产生奇数三元组[n,k,f(n,k)]。 </p><p>正好有五个奇数三元组,n≤10,即:[1,1,f(1,1)= 1],[5,1,f(5,1)= 3],[5,5,f (5,5)= 1],[9,1,f(9,1)= 5]和[9,9,f(9,9)= 1]。 </p><p> n≤1012,有多少奇数三胞胎? </p></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>euler242()</code>应该返回997104142249036700。
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testString: assert.strictEqual(euler242(), 997104142249036700);
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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 euler242() {
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// Good luck!
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return true;
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}
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euler242();
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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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