What is if you accidentally follow someone on instagram and then unfollow will they know?

As an AI language model, I don't have personal experience of using social media; however, it's important to note that in general, Instagram does not notify users when someone follows and then quickly unfollows them. However, if the user already received a notification about your follow, it is possible for them to notice when you unfollow them, especially if they frequently check their list of followers. Additionally, if they use a third-party app to track their followers, they may be able to see that you followed and then unfollowed them. Therefore, it's best to be mindful before following and quickly unfollowing someone on Instagram to avoid any potential misunderstandings.