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1. Use the formula to evaluate the series -3 + 6 - 12 + 24 - ...-a.
Sn =
al(1-7)
1-1
In the formula for a finite series, a, is the first term, r is the common ratio, and n is the number of terms.

1 Use the formula to evaluate the series 3 6 12 24 a Sn al17 11 In the formula for a finite series a is the first term r is the common ratio and n is the number class=

Respuesta :

ghanami

Answer:

Sn =(-2)^n-1

Step-by-step explanation:

hello :

the formula is :    Sn = a (r^n-1)/(r-1)

in this  exercice :  a = -3       r= 6/-3 = -12/6 = 24/-12  = -2

so : Sn = -3 ((-2)^n-1)/(-2-1)

Sn =(-2)^n-1

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