英语翻译
Given the set S = {p,q,r},T = {1,3,6},and S = {a,b,c},with f a function from S to T,defined by {(p,3),(q,6),(r,6)} and g a function from T to S defined by {((1,a),(3,b),(6,b)}.Find the composition of g with f,that is g o f.One of these two functions has an inverse.Find it.(2pts)