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06-07-2016
Mathematics

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what is the sum of the n terms of the series 5 10 20 40 . . . ?

Respuesta :

06-07-2016

Hello,

[tex]5+10+20+40+...\\ =5(1+2+2^2+2^3+...+2^{n-1})\\ [/tex]
[tex]=5*\frac{5^n-1}{4}[/tex]

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