Given:
The universal set is
U = {c, d, e, f, g, h, i}
The other set is
A = {c, e, h, i}
To find:
The set A'
Solution:
We know that,
Complement of a set A = Universal set - set A
A' = U - A
= {c, d, e, f, g, h, i} - {c, e, h, i}
= {d, f, g}
Therefore, the set A' is A' = {d, f, g}.