Question

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. ​

Answer 1

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Answer 2

`\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`