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

Prove or give a counterexample to the statement:

S ∪ T = T ↔ S ⊆ T

3. The attempt at a solution

What I did:

Let S={1,2,3,4} and T = {1,2}

S ∪ T = {1,2} = T

S ⊆ T

{1,2,3,4} ⊈ {1,2}

Therfore it is False . . .but the answer in the book says that it is true

Thanks

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# Homework Help: If and only if Proof

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