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Algebra

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Moderate

Arithmetic Series Starts At 71

ALGEBR-MKLAKV

Find the sum of the terms from $n=71$ to $n=215$ of the arithmetic sequence:

$$a_n=-32.7-15.4(n-1)$$

A

$317,086$

B

$316,008$

C

$-400,787.5$

D

$-321,827.5$

E

none of the above