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06-07-2016
Mathematics

Answered

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

Verified Answer :

06-07-2016

Hello,

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

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