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Could someone please show me how to prove this?

## Homework Statement

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

## Homework Equations

## 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