20) Let \( A=\{1,2,3,4\}, B=\{1,2,3,4,5,6\} \) and \( C= \) \( \{1,2,3,4,5,6,7,8,9,10\} \).If \( f \) be a function from set \( A \) to Set \( B \) given by \( f(x)=x+2 \) and \( g \) is a function from Set B to Set C given by \( g(x)=x-1 \) then find \( (f \circ g)(x) \).