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prove or disprove using logical equivalences (a) p ? (q ? r) ?? (p ? q)...

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Advance Math

prove or disprove using logical equivalences

(a) p ? (q ? r) ?? (p ? q) ? r

(b) x ? (¬y ? z) ?? ((x ? y) ? ¬z) ? (x ? ¬(y ? z))

(c) (x ? y ? ¬z) ? (¬x ? y ? z) ?? ¬y ? (x ? z)

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