64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
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---
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id: 5900f3801000cf542c50fe93
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challengeType: 5
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title: 'Problem 20: Factorial digit sum'
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videoUrl: ''
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localeTitle: 问题20：因子数字和
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---
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## Description
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<section id="description"> <var>n</var> ！意味着<var>n</var> ×（ <var>n</var> - 1）×...×3×2×1例如，10！ = 10×9×...×3×2×1 = 3628800， <br>和数字10中的数字之和！是3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.找到数字之和<var>n</var> ！ </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>sumFactorialDigits(10)</code>应该返回27。
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testString: 'assert.strictEqual(sumFactorialDigits(10), 27, "<code>sumFactorialDigits(10)</code> should return 27.");'
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- text: <code>sumFactorialDigits(25)</code>应该返回72。
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testString: 'assert.strictEqual(sumFactorialDigits(25), 72, "<code>sumFactorialDigits(25)</code> should return 72.");'
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- text: <code>sumFactorialDigits(50)</code>应该返回216。
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testString: 'assert.strictEqual(sumFactorialDigits(50), 216, "<code>sumFactorialDigits(50)</code> should return 216.");'
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- text: <code>sumFactorialDigits(75)</code>应该返回432。
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testString: 'assert.strictEqual(sumFactorialDigits(75), 432, "<code>sumFactorialDigits(75)</code> should return 432.");'
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- text: <code>sumFactorialDigits(100)</code>应该返回648。
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testString: 'assert.strictEqual(sumFactorialDigits(100), 648, "<code>sumFactorialDigits(100)</code> should return 648.");'
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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 sumFactorialDigits(n) {
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// Good luck!
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return n;
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}
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sumFactorialDigits(100);
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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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