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(A) The given circuit consists of two $NOR$ gates. The first $NOR$ gate has inputs $A$ and $B$,so its output is $Y_1 = \overline{A+B}$.The second $NOR

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$OR$ gate

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(A) The given circuit consists of two $NOR$ gates. The first $NOR$ gate has inputs $A$ and $B$,so its output is $Y_1 = \overline{A+B}$.The second $NOR$ gate has both inputs connected to $Y_1$. $A$ $NOR$ gate with both inputs tied together acts as a $NOT$ gate.Therefore,the final output $Y = \overline{Y_1 + Y_1} = \overline{Y_1} = \overline{(\overline{A+B})} = A+B$.The Boolean expression $Y = A+B$ represents an $OR$ gate.Thus,the circuit is equivalent to an $OR$ gate.

The logic circuit shown below is equivalent to which of the following?

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