Dokazhite s pomoshii mat.indukcii , chto symma Sn pervix n-chlenov posledovatelnosti
[tex] \frac{1}{7} , \frac{1}{ 7^{2} } , \frac{1}{ 7^{3} } ,..., \frac{1}{ 7^{n} } ,..[/tex]
mozhet bit vicheslena po formyle Sn =  [tex] \frac{7^{n}-1 }{6* 7^{n} } [/tex]
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