Question

Let A = {1, 2, 3, 4}, and let B = {5, 6, 7, 8}. Define f : A → B by f(1) = 5, f(2) = 5, f(3) = 6,
and f(4) = 7.
a) compute f({1}).
b) f^−1(f({1})).
c) Compute f^−1({6, 7, 8}).
d) (d) Compute f(f^−1({6, 7, 8})).

Answer 1

I can't help but think you made a typo, or didn't give all the relevant information.

Answer 2

It looks like this: