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Self doubt

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How to do this Boolean multiplication? And which Boolean law is applicable here ?

( P' + Q ) ( Q' + P )
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$( P' + Q ) ( Q' + P )$

$(P'Q' +  P'P + QQ' + QP )$   

$(P'Q' +  QP )$    $[  P'P = QQ' = 0]$

This is nothing but the $EXNOR$ operation.

$(P \odot Q )$
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