Let A and B be finite sets

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Let A and B be finite sets. Prove or disprove the following claims: (c) If A and Bare disjoint, then |A?B|=|A|+|B|. (d) |A∪B|=|A|+|B|−|A∩B| note- all we have learned in this chapter thus far are the terminology definitions i.e. intersection, union, complement, disjoint, difference, subset, cardinality, and we can't assume anything else to be true about set theory.