Question: True or False: This is a valid proof approach that would prove the claim Consider the claim that (21n : n EZ} U {14n :

True or False: This is a valid proof approach that would prove the claim

Consider the claim that (21n : n EZ} U {14n : n E Z} C { 7n : n EZ}. Consider the proof that shows if x E ( 21n : n E Z. then x E { 7n : n EZ} or if x E { 14n : n E Z } then x E { 7n : n E Z)

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