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Which of the following is simplified sum of product form for the Boolean expression? $\left(\mathrm{P}+\mathrm{Q}^{\prime}+\mathrm{R}^{\prime}\right)\left(\mathrm{P}+\mathrm{Q}^{\prime}+\mathrm{R}\right)\left(\mathrm{P}+\mathrm{Q}+\mathrm{R}^{\prime}\right)$

  1. $\mathrm{P}+\mathrm{QR}^{\prime}$
  2. $\mathrm{P}+\mathrm{Q}^{\prime} \mathrm{R}$
  3. $\mathrm{P}+\mathrm{Q}^{\prime} \mathrm{R}^{\prime}$
  4. $\mathrm{P}^{\prime}+\mathrm{Q}^{\prime} \mathrm{R}^{\prime}$

     

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