Question

if A={p,q,r} B={ }then find A union B and A intersectionB what do you observe

Answer 1

A union B is set A itself as setB is a null set
A intersection B is also a null set as instersectiom with null set is also null set becoz there are no common elements between setA and set B
HOPE THIS HELPS U!!!

Answer 2

AUB={p,q,r}
A intersection B={}
therefore,
AUB=A
A intersection B=B