Prove the first associative law from Table I by showing
Chapter 2, Problem 2.2.21(choose chapter or problem)
Prove the first associative law from Table I by showing that if A, B, and C are sets, then A U (B U C) = (A U B) U C.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer