Math Question: What is the upper bound of the infinite sequence 1/x^2, where xE{R\0} We know that x={1, 1/4, 1/9, 1/16,.....} Since all x here are greater than 0 or less than equal to 1. Can't we take 1 as an upper bound here(My tutorial instructor has mentioned so in an answer sheet) I'm confused. Can someone explain? Thanks!