Let f = {(3, 1),

Let f = {(3,1), (9,3), (12,4)} and

g = {(1,3), (3,3), (4,9), (5,9)}

Now,

range of f = (1, 3, 4}

domain of f = {3, 9, 12}

range of g = {3,9}

domain of g = (1, 3, 4, 5}

since, range of f ⊂ domain of g

∴ gof is well defined.

Again, the range of g ⊆ domain of f

∴ fog in well defined.

Finally, gof = {(3,3), (9 ,3), (12,9)}

fog = {(1,1) , (3,1), (4,3), (5,3)}