"Let f : X→ Y and g : Y→ Z are invertible functions then1gof is not invertible2"gof is invertible and (gof) -1 ≠ f-1og -13gof is invertible and (gof) -1 = f-1og -14gof is not ontoAnswer & explanation+Correct answer: option 3Show that (gof) (f -1 o g-1) (x) = x.
