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First Seven Terms of a Geometric Series

ALGEBR-EY1TGX

Find the sum of the first 7 terms in the sequence defined by the formula:

$$a_{n}=14(2.3)^{n-1}$$

A

$1448.713826$

B

$632.273$

C

$-3677.504$

D

$3655.965866$

E

none of the above