9. The sum, Sn, of the first n terms of a geometric progression is given by Sn = 3" - 1. (a) the sum of the first 8 terms.

asked Mar 2, 2022 126k views

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9. The sum, Sn, of the first n terms of a geometric progression is given by Sn = 3" - 1.

(a) the sum of the first 8 terms.

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$\boxed{\sf S_n=3^n-1}$

Now

$\\ \sf\longmapsto S_8=3^8-1$

$\\ \sf\longmapsto S_8=6561-1$

$\\ \sf\longmapsto S_8=6560$

Tvr answered Mar 9, 2022

by Tvr

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