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  • 06-07-2016
  • Mathematics
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Which expression represents the series 1+5+25+125+625?

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caylus
caylus caylus
  • 06-07-2016
Hello,

s=1+5+25+125+625 is the sum of the 5 terms of the geometric serie 1,5,25... 1 is the  first term and 5 the ratio.


[tex] s=\frac{5^{5} -1}{5-1}=\frac{3124}{4}=781[/tex]


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