Mathematics for Computing

Mathematics for Computing
1

Question 1
Solution
Given A = {1, 2, 3, 4} and B = {1, 2, 3}
(c)
A B
1
1
2
2
3
2

3
4
(a) Image of 3 is 1
(b) Co-domain of f = {1, 2, 3, 4}
(d) As each element of co-domain is mapped by one or two element of domain, therefore, the
given function is surjective.
3