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 Sep 18, 2022
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Calculate $S_{8}$ when $a_{1}=8$ and $r= -\frac{1}{2}$
Difficulty: Easy
A: 
$-\frac{25}{2}$
B: 
$\frac{85}{16}$
C: 
$\frac{55}{8}$
D: 
$-\frac{95}{32}$
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NETNUST Entry TestMathematicsSequence and Series