Let A and B be sets in a finite universal set U. List the following in order of increasing size.
a) | A |,. | A ∪ B |,. | A ∩ B |. | U |.| ∅ |
b) |A − B|. | A ⊕ B|. | A | + | B |. |A ∪ B |, | ∅|
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