Y la cifra del final es…

novembre 22, 2011 //

Calcula en qué cifra termina el resultado de la suma:

1 + 9 + 9² + 9³ + 9⁴ + 9⁵ + ··· + 9²⁰⁰⁹+ 9²⁰¹⁰+ 9²⁰¹¹

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