[" (7) If "x" and "y" are two sets in "],[qquad [n(x)=11,],[38],[38]" ind "n(xny)=?]

If X and Y are two sets such that n(X)=17,n(Y)=23 and n(X uu Y)=38 find n(X nn Y).

A and B are two sets. If n(A) = 17, n(B) = 23, and n(AuuB) = 38 find n(AnnB) .

If X and Y are two sets such that n(X)=17 , n(Y)=23 and n(XuuY)=38 , Find n(Xnn Y) .

X and y are disjoint sets. If n(X) = 40 and n(Y)= 28, then find n(X-y)+n(Y-X)

If X and Y are two sets such that n(X) = 17, n(Y) = 23 and n(X cap Y) = 38 , find n(X or Y) .

If X and Y are two sets such that n (X)=17, n (Y)= 23 and n (Xuu Y)= 38 find n (X nnY) .

If X and Y are two sets such that n ( X) =17,n ( Y) =23, and n ( Xuu Y) =38 find n ( XnnY)

If A and B are two sets such that : n(A)=17, n (A uu B)=38 and n (A nn B)=2 . Find: n (B), n (A - B) and n (B - A).