C. Given three sets P, Q and R such that: P = (x:x is a natural number between 10 and 16), Q = fy:y is an even number between 8 and 20), and R 7, 9, 11, 14, 18, 20} Solve the following: 1. Find the difference of two sets P and Q 2. Find Q-R 3. Find R-P 4. Find Q-P​