Question

scrieti ca putere a lui2 numarulN+2,unde N=2+2 la 2 +2 la 3+...+2 la 2014

Answer 1

N=2+2^2+2^3+...+2^2014 Inmultim n cu 2. Si 2N=2^2+2^3+....+2^2015 Facem 2N-N si obtinem N=2^2015-2. Numarul N+2=2^2015-2+2=2^2015. Succes