Gate2017 cs Q13

13The statement (¬p)⇒(¬q) is logically equivalent to which of the statements below?
I. p⇒q
II. q⇒p
III. (¬q)∨p
IV. (¬p)∨q

Option : D
Explanation :
Option D.
(∼p)⇒(∼q)
∼(∼p)∨(∼q)
p∨(∼q)
(∼q)∨p ----------------> III is True
q⇒p -----------------> II is True

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