Q53

MCQ2 marks, −0.67

Which one of the following Boolean expressions is NOT a tautology?

(A)

$((\,a\,\to\,b\,)\,\wedge\,(\,b\,\to\,c))\,\to\,(\,a\,\to\,c)$

(B)

$(\,a\,\to\,c\,)\,\to\,(\,\sim b\,\to\,(a\,\wedge\,c))$

(C)

$(\,a\,\wedge\,b\,\wedge\,c)\,\to\,(\,c\vee\,a)$

(D)

$a\,\to\,(b\,\to\,a)$

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