Hhuzai07idn
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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. ​

Sagot :

[tex]\boxed{\sf S_n=3^n-1}[/tex]

Now

[tex]\\ \sf\longmapsto S_8=3^8-1[/tex]

[tex]\\ \sf\longmapsto S_8=6561-1[/tex]

[tex]\\ \sf\longmapsto S_8=6560[/tex]
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