(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Prove the following statement:

A is a subset of B if and only if (X/B) is a union of (X/A)

2. Relevant equations

3. The attempt at a solution

I really don't understand how to prove these types of problems. I was thinking about proving the contrapositive, which would be If A is not a subset of B, then (X/B) is not a union of (X/A), right?

Could someone please show me what to do?

Thank you very much

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# Homework Help: Operations on sets

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