No, only if both sets are empty. The intersection of disjoint
sets is always empty.
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A Forest is a disjoint union of trees
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Disjoint means they have no elements in common. The union is the
set of elements containing all elements from both sets. Since there
is no overlap, the union will have 5+7 elements.
Therefore the answer is 12.
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Yes,Because not all disjoint no equivalent other have disjoint
and equivalent
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Not necessarily. For a counterexample, A and C could be the same
set.