Answer:
(iii) C = {0}.
iv) The set of all triangles having four sides is a NULL ser
Step-by-step explanation:
Complete question
Identify the following sets as null set or singleton set.
(i) A = {x : x ∈N, 1 < x < 2}
(ii) B = The set of all even natural numbers which are not divisible by 2
(iii) C = {0}.
(iv) D = The set of all triangles having four sides.
A null set is a set that contains no element while a singleton set is. a set that has only one element
The set C ={0} has just one element which is zero. This shows that the set is a singleton set
Also a triangle only has 3sides. No triangle can have 4sides. Hence the set of all triangles having four sides is a NULL SET
