{10} with
f = {(1, 10),
(2, 10), (3, 10), (4, 10)}
(ii) g : {5, 6, 7,
8} {1, 2, 3, 4}
with
g = {(5, 4), (6,
3), (7, 4) (8, 2)}
(iii) h : {2, 3, 4,
5} {7, 9, 11,
13} with
h : {(2, 7), (3,
9), (4, 11), (5, 13)}.
Answer:
(i) f : {1, 2, 3, 4} 
{10}
f(1) = 10, f(2)
= 10, f(3) = 10, f(4) = 10
is not
one-one.
(i) g : {5, 6,
7, 8} {1, 2, 3, 4}
Here g(5) = 4 and g(7) = 4
for 
is not
one-one.
(iii) h : {2, 3, 4, 5} {7, 9, 11,
13}
= 7, h(3) =
9, h(4) = 11, h (5) = 13
is one-one.
Also for every 
there exists
distinct value of x in {2, 3, 4, 5}
function ?h?
is onto.
Hence function
?h? is invertible.
is given by
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