11. a function f: r >r is defined by f(r) = x+1,r e q =t, r e r- q. prove that f has a discontinuity of the second kind at every point c in r. af +he funetions

11. A function f: R >R is defined by f(r) = x+1,r e Q =T, r E R- Q. Prove that f has a discontinuity of the second kind at every point c in R. af +he funetions