mekhaiyasanai mekhaiyasanai

23-08-2022
Mathematics

contestada

If each term in a geometric sequence is defined as
an = -6. (-1)"-1
what's the sum of the first 20 terms of
the sequence?

A. 0
B. 6
C. 120
D. 15

Respuesta :

Medunno13 Medunno13

27-08-2022

Answer:

A

Step-by-step explanation:

[tex]a_n=-6(-1)^{n-1} [/tex]

The first term is -6 and the common ratio is -1.

The sum is thus

[tex]\frac{6(1-(-1)^{20})}{1-(-1)}=0[/tex]

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