Query from Beginner module "Types of Machine Learning, Supervised Learning and Regression" Quiz

Hi,

I have a query about the solution for the first question i.e. Which of the following is not a supervised learning algorithms?

The answer is supposed to be Clustering. But when I marked it, it is not accepting that as the correct answer. Instead it is accepting classification as the correct answer which is incorrect because Classification and Regression are the two major categories of algorithms that fall under this category.

Please correct me if I'm wrong about my understanding. If not please correct it on the website.

Kind regards

Pavan.