If n (A)= 75, n (B) = 45, n `(AcupB)`= 90, then find n`[(A - B) cup (B - A)]`

If n(A)=75,n(B)=45, n(AuuB) =90,then find n[(A-B)uu(B-A)]

If n(A)=80,n(B)=30,n(AuuB)=100 ,then find n[(A-B)uu(B-A)] .

Find (N cap Z) cup R

If n(A-B)=10,n(AnnB)=5 and n(B-A)=20 ,then find n(B) and n(AuuB) .

If n(A uu B) = 50 , n(A) = 31 and n(B) = 23 , find n(A nn B) , n(A-B) and n(B-A)

If n(A)=110,n(B)=300,n(A-B)=50,then find n(AUB).

If n(A) = 30 , n(B') = 6 , n(A nn B) = 25 and n(B-A) = 37 , find n(B) , n(U) , n(A uu B) and n(A - B)

If X~B(n,p) , then find Var(X).

If n(A')=15 , n(B)=5 , n(A nn B)=3 and n( uu ) = 30 then determine n(A) , n(A uu B) and n(A-B) where A and B are subset of a universal set U.

Is n(A-B)=n(A)-n(B)?