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

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

User Elitalon
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Hello,


5+10+20+40+...\\ =5(1+2+2^2+2^3+...+2^(n-1))\\

=5*(5^n-1)/(4)

User Arik Kfir
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