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densk [106]
3 years ago
14

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

Mathematics
1 answer:
katrin2010 [14]3 years ago
3 0
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.


s=\frac{5^{5} -1}{5-1}=\frac{3124}{4}=781


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