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The Fifth Term in a Set of 5 Terms

GMAT-N14P6I

Assume that $\cfrac{2}{3}(p+q)$ represents the mean of a set containing $5$ terms.

If the set includes the $4$ following terms, $p$, $q$, $p+1$, and $p-1$, what expression represents the fifth term?

A

$7p+q$

B

$p+7q$

C

$p+q$

D

$\cfrac{1}{3}(p+7q)$

E

$\cfrac{1}{3}(p+q)$