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Cat face 2+2^2+2^3+...+2^2017?

Răspuns :

Rayzen
[tex]\boxed{2^1+2^2+2^3+...+2^{n} = 2^{n+1}-2} \\ \\ 2^1+2^2+2^3+...+2^{2017} = 2^{2017+1}-2 \Rightarrow \\ \\ \Rightarrow 2^1+2^2+2^3+...+2^{2017} = 2^{2018}-2[/tex]

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