Question: Question 1 Consider the following relations: Part a: Evaluate sigma _ ( A ) 4 Q times R Part b: Evaluate pi

Question 1
Consider the following relations:
Part a: Evaluate \sigma _(A)4Q\times R
Part b: Evaluate \pi _(BE)(\rho _(ClarrA)R\times \pi _(CE)S)T\cup \pi _(CD)SR|\times |S|\times |T
Question 1 Consider the following relations: Part

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