Q6

MCQ1 mark, −0.33

Which one of the following options is not a property of Boolean Algebra? Note: ${+}$ is OR operation, $\cdot$ is AND operation, and ${\prime}$ is NOT operation

(A)

$a+b=b+a$

(B)

$a \cdot a^{\prime}=1$

(C)

$a+a^{\prime}=1$

(D)

$a \cdot b=b \cdot a$

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