Answer:
Given
f = {(1, 2), (3, 5), (4, 1)}
Here
Rf = {1, 2, 5} = Dg and Df = {1, 3, 4}
Now,
(gof) (1) = g(f(1)) = g(2) = 3
(gof)(3)
= g(f(3)) = g(5) = 1
(fog)
(4) = g(f(4)) = g(1) = 3
So,
gof = {(1, 3), (3,1), (4,3)}
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