研究所、轉學考(插大)◆計算機數學題庫下載題庫

3. (3%) Let A, B, C be finite sets. Which of the following statements is true?
(A) If A∪C = B ∪ C, then A = B 
(B) If A ∩ C = B∩ C, then A = B
(C) If A -C = B -C, then A = B
(D)