1 votes 1 votes Let f:[0,1]→R is a function such that f(x)={a,b,if x∈Q∩[0,1]if x∈Qc∩[0,1], where Q is set of rational numbers. For any partition P of [0,1], if a<b then U(f,P)−L(f,P)= (A) a−b. (B) b−a. (C) (a−b)2. (D) 1. mathematics asked Sep 22, 2017 mathematics 369 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.