Question

Determinati numarul natural n , stiind ca 2^n + 2^n+2 + 2^n+1 = 56 .

Answer 1

$2^{n}(1+4+2)=56 \\ 2^{n}*7=56 \\ 2^{n}=8 \\ 2^{n}= 2^{3 } \\ n=3$