Tonyrankov Tonyrankov

11-01-2022
Mathematics

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1. Find Sn of a geometric sequence if:

n = 6, a1 = 16 and a3 = 4

Respuesta :

Аноним Аноним

11-01-2022

Answer:

Step-by-step explanation:

Sn = a1 * (r^n - 1) / (r-1)

a3 = a1r^2 = 4, and

a1 = 16 , so:

r^2 = 4/16 = 0.25

r = 0.5

S6 = 16 * (0.5^6 - 1) / (-0.5)

= 16 * 1.96875

= 31.5.

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