Răspuns :
Răspuns:
B= 1+3¹+3²+3³+...+3¹¹⁶
B= (1+3¹+3²)+ (3³+3⁴+3⁵)+(3⁶+3⁷+3⁸)+...+(3¹¹⁴+3¹¹⁵+3¹¹⁶)
B= (1+3+3²)+ 3³(1+3+3²)+3⁶(1+3+3²)+...+3¹¹⁴(1+3+3²)
B=(1+3+3²) * (1+3³+3⁶+...+3¹¹⁴)
B= 13*(1+3³+3⁶+...+3¹¹⁴) care e divizibil cu 13
Răspuns:
B= 1+3¹+3²+3³+...+3¹¹⁶
B= (1+3¹+3²)+ (3³+3⁴+3⁵)+(3⁶+3⁷+3⁸)+...+(3¹¹⁴+3¹¹⁵+3¹¹⁶)
B= (1+3+3²)+ 3³(1+3+3²)+3⁶(1+3+3²)+...+3¹¹⁴(1+3+3²)
B=(1+3+3²) * (1+3³+3⁶+...+3¹¹⁴)
B= 13*(1+3³+3⁶+...+3¹¹⁴) care e divizibil cu 13