1
GATE CSE 1992
MCQ (Single Correct Answer)
+1
-0.3
Which of the following is/are tautology?
A
$$\left( {a \vee b} \right) \to \left( {b \wedge c} \right)$$
B
$$\left( {a \wedge b} \right) \to \left( {b \vee c} \right)$$
C
$$\left( {a \vee b} \right) \to \left( {b \to c} \right)$$
D
$$\left( {a \to b} \right) \to \left( {b \to c} \right)$$
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