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PLEASE HELP!!!

Use The Formula to evaluate the series 3 - 9 + 27 - 81 + . . . - a8

In the formula for a finite series a1 is the first term r is the common ratio and n is the number of terms.

A. -19,680

B. -9840

C. -4920

PLEASE HELP Use The Formula to evaluate the series 3 9 27 81 a8In the formula for a finite series a1 is the first term r is the common ratio and n is the number class=

Respuesta :

DeanR

r=-3, n=8, a_1=3

S = 3(1 - (-3)^8)/(1 - -3) = -4920

Choice C


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