Given that f(x) is a function such that f(1)=2, f(4)=3, f(7)=4, and f^{-1}(x) is the inverse of f(x), what is f^{-1}(f^{-1}(3))?
f−1(3)=4f−1(f−1(3))=f−1(4)=7
+865 
