# DLD cse

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here 4 NOR gates required

$\left ( \left ( X_{1}+X_{3} \right )'+\left ( X_{2}+X_{3} \right )'+\left ( X_{4}+X_{3} \right )' \right )'$
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## Related questions

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what will be the simplified expression of the following ? 1-$\bar{P}\bar{Q}+\bar{Q}\bar{R}+\bar{R}\bar{S}+\bar{T}\bar{S}+\bar{T}\bar{R}+S$ My answer is this please me if its wrong $\bar{P}\bar{Q}+\bar{T}+\bar{R}+S$