s939758 s939758

14-01-2021
Mathematics

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Find the sum of the first 8 terms of the sequence an=2(4) ^n-1

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surjithayer10 surjithayer10

14-01-2021

Answer:

Step-by-step explanation:

a1=2

r=4

n=8

[tex]s_{8}=2\frac{4^8-1}{4-1} =\frac{2}{3} (4^8-1)=\frac{2}{3} (65536-1)=\frac{2}{3} (65535)=2 \times 21845=43690[/tex]

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