section
a) A and B are any two disjoint sets. If n(A)
-x and n(B) =y, find n(AUB).
b) If n(A)=p, n(B) q, and n (AB)=r, show this information in a Venn-diagram and
show that n (AUB)
n(A)+n(B)-n(AB).
c) If X and Y are two overlapping subsets of a universal set U, write the relation between
n(U), n (XY), and n (XUY).


Qno 1 pls!!