It seems like your message might contain a typo or an incomplete query. If you intended to ask something specific, please provide additional details or clarify your inquiry so that I can assist you effectively.

It looks like you've provided a link to a specific question on the Toppr website regarding a mathematical set. However, I currently don't have the ability to access external websites directly. If you could provide the details of the question or the specific issue you need help with, I'd be more than happy to assist you in solving it.