freeCodeCamp/curriculum/challenges/italian/10-coding-interview-prep/project-euler/problem-235-an-arithmetic-geometric-sequence.md

---
id: 5900f4571000cf542c50ff6a
title: 'Problema 235: Sequenza geometrica aritmetica'
challengeType: 5
forumTopicId: 301879
dashedName: problem-235-an-arithmetic-geometric-sequence
---

# --description--

Data la sequenza aritmetico-geometrica $u(k) = (900 - 3k)r^{k - 1}$.

Sia $s(n) = \sum_{k=1 \ldots n} u(k)$.

Trova il valore di $r$ per il quale $s(5000) = -600\\,000\\,000\\,000$.

Dai la tua risposta arrotondata a 12 cifre dopo il punto decimale.

# --hints--

`arithmeticGeometricSequence()` dovrebbe restituire `1.002322108633`.

```js
assert.strictEqual(arithmeticGeometricSequence(), 1.002322108633);
```

# --seed--

## --seed-contents--

```js
function arithmeticGeometricSequence() {

  return true;
}

arithmeticGeometricSequence();
```

# --solutions--

```js
// solution required
```