Question

Let R = {(a, 1/a): a ∈ N and 1 < a < 5}. Find the domain and range of R.

Answer 1

By substituting values we get

R = {(2, 1/2), (3, 1/3), (4, 1/4)}

So we get

dom (R) = {2, 3, 4}

range (R) = {1/2, 1/3, 1/4}