GATE | GATE CS 2008 | Question 33

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

(A)

Only I, II and III

(B)

Only I, II and IV

(C)

All of I, II, III and IV

(D)

Only I and II 

Answer:(A)
Explanation:

I and II are same by Demorgan’s law

The IIIrd can be simplified to I. 

since is true always 

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