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Could someone please show me how to prove this?

1. The problem statement, all variables and given/known data

Determine |A U B| in terms of |A| and |B| assuming that A and B are disjoint

2. Relevant equations

3. The attempt at a solution

I know that A U B must be finite because A and B are disjoint, but besides that I don't know how I would go about proving this.

Could someone please show me how to?

Thank you

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# Homework Help: Disjoint proof

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