3. Let P=0, 41,Q=(1,5), R=(4,6), and S=(1,6). The universe of discourse is the real interval (0, infinity). A denotes complement of A. Describe the following sets in both interval notation and set-builder notation. (i) POQ, (ii) PUQ (iii) POR, (iv) SAR, (v) PS1 and (vi) (v) SQ-1 4. Argue that, in general, (AXB)XC # AX(BXC) where AxB is the Cartesian product of A and B