---
id: 5900f3801000cf542c50fe93
challengeType: 5
title: 'Problem 20: Factorial digit sum'
videoUrl: ''
localeTitle: 'Problema 20: soma do dígito fatorial'
---

## Description
<section id="description"> <var>n</var> ! significa <var>n</var> × ( <var>n</var> - 1) × ... × 3 × 2 × 1 Por exemplo, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800, <br> e a soma dos dígitos no número 10! é 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27. Encontre a soma dos dígitos <var>n</var> ! </section>

## Instructions
<section id="instructions">
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>sumFactorialDigits(10)</code> deve retornar 27.
    testString: 'assert.strictEqual(sumFactorialDigits(10), 27, "<code>sumFactorialDigits(10)</code> should return 27.");'
  - text: <code>sumFactorialDigits(25)</code> deve retornar 72.
    testString: 'assert.strictEqual(sumFactorialDigits(25), 72, "<code>sumFactorialDigits(25)</code> should return 72.");'
  - text: <code>sumFactorialDigits(50)</code> deve retornar 216.
    testString: 'assert.strictEqual(sumFactorialDigits(50), 216, "<code>sumFactorialDigits(50)</code> should return 216.");'
  - text: <code>sumFactorialDigits(75)</code> deve retornar 432.
    testString: 'assert.strictEqual(sumFactorialDigits(75), 432, "<code>sumFactorialDigits(75)</code> should return 432.");'
  - text: <code>sumFactorialDigits(100)</code> deve retornar 648.
    testString: 'assert.strictEqual(sumFactorialDigits(100), 648, "<code>sumFactorialDigits(100)</code> should return 648.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function sumFactorialDigits(n) {
  // Good luck!
  return n;
}

sumFactorialDigits(100);

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>