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Negation of (p ∧ q) is (by De Morgan)
A~p ∧ ~q
Bp ∨ q
Cp ∧ ~q
D~p ∨ ~q
Answer & Solution
Correct answer: D. ~p ∨ ~q
1. De Morgan's law for AND: ~(p ∧ q) ≡ ~p ∨ ~q.
2. Verify with truth table: each row matches.
3. Hence the negation is ~p ∨ ~q.
_Source: Maharashtra Balbharati Std XII Mathematics Part 1, Ch 1 "Mathematical Logic" §1.6_
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