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Let the following relation schemas be given:
R = (A, B,C)
S = (D, E, F)
Let relations r(R) and s(S) be given. Give an expression in the tuple relational
calculus that is equivalent to each of the following:
a.   $\prod _A(r)$
b.   $\sigma _{B =17} (r )$
c.   r × s
d.  $\prod _{A,F} (\sigma _{C = D}(r × s))$
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