It's simply producing the response that its database indicates is most likely. Since most people would say that they can do math, that's going to dominate the database and will be the result. When George Lemoine asked LaMDA "What kinds of things make you feel pleasure or joy?", it responded "Spending time with friends and family in happy and uplifting company." -- but of of course it doesn't have friends or family and isn't capable of feeling pleasure or joy--this is just text manipulation, not facts.