P and Q are two propositions. Which of the following logical expressions are…

GATE · 2008 · CS

P and Q are two propositions. Which of the following logical expressions are equivalent? 

1. A.

   Only I, II and III
   

2. B.

   Only I, II and IV
   

3. C.

   All of I, II, III and IV
   

4. D.

   Only I and II 
   

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