Which expression represents the series 1+5+25+125+625?

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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 · Answer 1 · 2016-07-06T18:09:57+02:00

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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