LetS: be the universal set, where: S={1,2,3,...,18,19,20}

Let setsA andB be subsets ofS

where: SetA

A={1,3,5,7,11,12,14,20}

SetB

B={1,2,3,4,10,11,13,16,20}

SetC

C={2,3,5,7,8,10,12,15,17,18}

Find the number of elements in the set(AB)n(AB)=

Find the number of elements in the set(BC)n(BC)=

Find the number of elements in the set(AC)n(AC)=