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MCQ (Single Correct Answer)
GATE CSE 2009
Consider the following well-formed formulae:
¬∀x(P(x))¬∀x(P(x))
¬∃x(P(x))¬∃x(P(x))
¬∃x(¬P(x))¬∃x(¬P(x))
∃x(¬P(x))∃x(¬P(x))
Which of the above are equivalent?
I and III
I and IV
II and III
II and IV
