Question

Let A and B be two sets in the same universal set. Then, $A-B=$
(a) $A\cap B$
(b) $A\text{'}\cap B$
(c) $A\cap B\text{'}$
(d) none of these.

Answer 1

(c) $A\cap B\text{'}$
A$-$B belongs to those elements of A that do not belong to B.
∴ A$-$B = $A\cap B\text{'}$