nityj3u4nissa
nityj3u4nissa nityj3u4nissa
  • 06-07-2016
  • Mathematics
contestada

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

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caylus
caylus caylus
  • 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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