blog in subfolder. show 3 recent posts on domain name.

My wordpress blog is in a subfolder such as https://subfolder.wordpressblog.com

I would like to show the 3 most recent posts on the main domain https://www.wordpressblog.com

I would like to do that without showing the most recent 3 posts on the https://subfolder.wordpressblog.com The subfolder would contain all the posts that I and some people could read but the main domain name would contain the first three posts without the readers knowing where those three posts are coming from.