Question

which of the following is a null set ?
(1) μ - (A ∪ B)
(2) μ ∩ A
(3)A ∪ A rays to c
(4) A ∩ A rays to c

Answer 1

hey mate here is your answer
option 1
is a null set

Answer 2

(1) is a a null set only if the U universal set contains only the the elements of set (a) and b