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(X uu Y) = 38 , find n(X nn Y) .

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).

If X and Y are two sets, then X nn (Y nn X)' equals

If X and Y are two non-empty sets, then what is (X - Y)' equal to

Let A and B be two sets such that n(A) = 3 and n(B) = 2. If (x, 1), (y, 2),(z, 1) are in A xx B , find A and B. where x, y and z are distinct elements.

A and B are two sets containing respectively m_1 and m_2 elements. If x le n(A uu B) le y , find x and y.

If f is a function satisfying f(x+y)=f(x)xxf(y) for all x ,y in N such that f(1)=3 and sum_(x=1)^nf(x)=120 , find the value of n .

Suppose x and y are two real numbers such that the rth mean between x and 2y is equal to the rth mean between 2x and y when n arithmatic means are inserted between them in both the cases. Show that : (n+1)/r-y/x=1 .