(a) Let let and let be given by i) Is finjective? Briefly explain. ii) Is f surjective? Briefly explain. iii) Is f'bijective? Briefly explain. v) Let (b) Let iv) Does f have an inverse function? Briefly explain. and let A = {x Nx 6), Prove that B = {x Nx 50}, f: A B -> C = {x N|20