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Diano4ka-milaya [45]
3 years ago
14

Find the sum of the geometric series if: n = 8, r = 3, a = 1.​

Mathematics
1 answer:
Evgen [1.6K]3 years ago
3 0

Answer:

\huge\boxed{S_8=3,280}

Step-by-step explanation:

The formula:

S_n=\dfrac{a_1(1-r^n)}{1-r}

Substitute:

n=8;\ r=3;\ a_1=1\\\\S_8=\dfrac{1\cdot(1-3^8)}{1-3}=\dfrac{1-6,561}{-2}=\dfrac{6,560}{2}=3,280

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