1. nu stiu
2.[tex]S = 1+6+6^2 +...........+6^{2013}\\
6S = 6+6^2 +6^3 +.........+6^{2014} =>\\
6S - S = 6^2014 - 1\\ =>S= \frac{6^{2014}-1}{5} [/tex]
[tex]3.\\29^{501} = 29* 29^{500}\\ =(25+4)* 29^{500} \\=( 5^{2} + 2^{2} )* 29^{500}\\ = 5^{2} * 29^{500} + 2^{2} * 29^{500} \\\boxed{= ( 2* 29^{250}) ^{2} +( 2* 29^{250}) ^{2}}[/tex]