Answer:
A ∩ B
set of elements in both A and B sets
Step-by-step explanation:
The shaded region represents the elements that are in both sets A and B
Mathematically,
if n(A) is the number of elements in set A
n(B) the number of elements in set B
then the shaded area has n(A ∩ B) elements
The number of elements in a set is also called the cardinality of the set
