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प्रश्न
State the dual of the following statement by applying the principle of duality.
p ∨ (q ∨ r) ≡ ~[(p ∧ q) ∨ (r ∨ s)]
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उत्तर
p ∧ (q ∧ r) ≡ ~[(p ∨ q) ∧ (r ∧ s)]
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