The output of the following circuit is

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(B) The circuit consists of two switches $p$ and $\sim p$ connected in parallel,which are then connected in series with a switch $q$.The logical expre

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$q$

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(B) The circuit consists of two switches $p$ and $\sim p$ connected in parallel,which are then connected in series with a switch $q$.The logical expression for the parallel combination of $p$ and $\sim p$ is $(p \lor \sim p)$.Since $(p \lor \sim p) = T$ (a tautology,represented as $1$ in switching circuits),the expression becomes $1 \land q$.Thus,the output is $1 \cdot q = q$.

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