If A ⊂ B, then which of the following is not true?

If A ⊂ B, then which of the following is not true?

  1. A.

    A U B = B

  2. B.

    A ⋂ B = A

  3. C.

    BC ⊂ AC

  4. D.

    B – A = ɸ


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