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7 - 8 . Evaluate the sum exactly. ( 1 0 points each ) n = 1 8 ( 2 5 ) n n =

7 - 8 .

Evaluate the sum exactly.

(10

points each

)

_{n = 1}^{} 8 (\frac{2}{5})^{n}

_{n = 1}^{} \frac{2}{n^{2} + 5 n + 6}

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