Question

If A and B are two non-empty sets then n(A – B) is given by
n(A) – n(A ∪ B)
n(A ∪ B) – n(A)
n(A) – n(A ∩ B)
n(A ∩ B) – n(A)

Answer 1

Answer:

I think third one is correct answer.

Answer 2

Answer:

3 option

Hope it helps thank you