If A and B are two sets such that `A xx B = phi`, then which of the following must be true ?

If A and B are two sets prove that Ann(B-A)=phi

If A and B are two sets prove that Ann(B-A)=phi

If A and B are two sets satisfying A-B = B - A. then which one of the following is correct?

If A and B are two sets satisfying A-B=B-A , then which one of the following is correct? (a) A=phi(b)A nn B=phi(d) None of these (c)A=B

If A and B are two finite sets such that A nn B != phi , then n (A uu B) =

State which of the following is true? phi={phi}

If the fraction a//b is positive, then which of the following must be true ?

A and B are non-empty sets A - B = A and B - A = B. Then which of the following is true ?

If A and B are two events and A ne phi, B ne phi then

Let A,B and C be sets such that A nn B sube C and A nn B!=phi. Then which of the following statements is not true?