You're right ... I've now submitted the correct one ... thank you. Edit: sigh The other submission is marked as a dupe, even though it's a different URL. I ca

You're right ... I've now submitted the correct one ... thank you. Edit: sigh The other submission is marked as a dupe, even though it's a different URL. I can't tidy it up, it's a mess, I think I'll just leave it alone and let the mods deal with it. Edit 2: Oh FFS, the URL on that one has been changed as well. I don't seem to be able to submit the right link. I'll try just once more. Edit 3: OK, I give up. The URL was right for all of 30 seconds, then got changed. I don't know why, I don't know how, it's enormously frustrating. I give up. People, the correct link is https://www.duolingo.com/math https://www.duolingo.com/math