Discrete Structures - Proving a statement true 

Trying to prove that the statement is true, which I am sure it is. Much like the last problem posted here, I am unsure how to go about solving it

I do not believe a negation is necessary but I could be wrong 


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  • Thank you for the help with the two questions I posted here, despite receiving just the answer, it does help!

  • No problem!

The answer is accepted.
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