If A and B are sets and AB SolutionLet x belongs to A B But

If A and B are sets and A-B =

Let x belongs to A - B

But A - B is given to be {null}

So, x = {null}, there can be no element that exists in A - B

Let there be two elements, a E A and b E B

Now, A - B = a - b.

But it is given that A - B = NULL

So, a - b = 0

a = b

This indicates that the element in A is equal to the element in B

By extension, we can say that any element in A must be equal to another element in B

So, A = B