Prove: (A∩B∩C)'=(A'∪B'∪C')

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How to prove that Prove: (A ∩ B ∩ C)'=(A'∪ B'∪ C') by first using Associative Law to insert brackets, and then using DeMorgan’s Law?

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$(A ∩ B ∩ C)'=((A ∩ B) ∩ C)'=(A ∩ B)'∪ C'=(A'∪ B') ∪ C'=A'∪ B' ∪ C'$