freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped.md

---
id: 5900f4231000cf542c50ff34
title: >-
  Problem 181: Investigating in how many ways objects of two different colours can be grouped
challengeType: 5
forumTopicId: 301817
dashedName: >-
  problem-181-investigating-in-how-many-ways-objects-of-two-different-colours-can-be-grouped
---

# --description--

Having three black objects B and one white object W they can be grouped in 7 ways like this:

(BBBW)(B,BBW)(B,B,BW)(B,B,B,W)

(B,BB,W)(BBB,W)(BB,BW)

In how many ways can sixty black objects B and forty white objects W be thus grouped?

# --hints--

`euler181()` should return 83735848679360670.

```js
assert.strictEqual(euler181(), 83735848679360670);
```

# --seed--

## --seed-contents--

```js
function euler181() {

  return true;
}

euler181();
```

# --solutions--

```js
// solution required
```