---
id: 5e9a093a74c4063ca6f7c15f
title: Data Cleaning Duplicates
challengeType: 11
videoId: kj7QqjXhH6A
dashedName: data-cleaning-duplicates
---

# --description--

*Instead of using notebooks.ai like it shows in the video, you can use Google Colab instead.*

More resources:

-   [Notebooks on GitHub](https://github.com/ine-rmotr-curriculum/data-cleaning-rmotr-freecodecamp)
-   [How to open Notebooks from GitHub using Google Colab.](https://colab.research.google.com/github/googlecolab/colabtools/blob/master/notebooks/colab-github-demo.ipynb)

# --question--

## --text--

The Python method `.duplicated()` returns a boolean Series for your DataFrame. `True` is the return value for rows that:

## --answers--

contain a duplicate, where the value for the row contains the first occurrence of that value.

---

contain a duplicate, where the value for the row is at least the second occurrence of that value.

---

contain a duplicate, where the value for the row contains either the first or second occurrence.

## --video-solution--

2