Which of the following propositions is tautology?
A.  (p v q)→q 

B.  p v (q→p) 

C.  p v (p→q) 

D.  Both (b) & (c) 

Option: C Explanation : A tautology is a statement that is always true.

A.  A tautulogy 
B.  A contradiction 
C.  Logically equivalent to p ^ q 
D.  All of above 
Option: C Explanation : 
A.  a v b → b ^ c 
B.  a ^ b → b v c 
C.  a v b → (b → c) 
D.  None of these 
Option: B Explanation : 
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