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b) x∈(AnB)' <=> x∉AnB <=> x∉A lub x∉B <=> x∈A' lub x∈B' <=> x∈(A'uB')
x∈(AnB)' <=> x∉AnB <=> x∉A lub x∉B <=> x∈A' lub x∈B' <=> x∈(A'uB')