In the name of ALLAH, the most beneficient, the most merciful

Discrete Mathematics (MTH202)

Question (select most suitable option)

  If A and B are disjoint finite sets then n(A U B) = ______.
n(A)−n(B)
n(A)+n(B)−n(A∩B)
n(A)+n(B)
n(A)+n(B)+n(A∩B)