3 years ago

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

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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