1. (1,3) 0 (2,4) as a single interval and prove that your answer is correct. That means that you need to prove equality of two sets. 2. Prove that if A and B are sets, and C is nonempty, and A x C : BXC,thenA=B. 3. Give the following union and intersection as a single interval. You don't need to justify your statement. 00 00 (a) n[;,k) (b) LagHE) 16:5 36:1