Question

PLS. Urgent! Doar 41!

Answer 1

${3}^{n} + {3}^{n + 1} + {3}^{n + 2} + {3}^{n + 3} + {3}^{n + 4}$
${3}^{n} (1 + {3}^{1} + {3}^{2} + {3}^{3} + {3}^{4} )$
${3}^{n} (1 + 3 + 9 + 27 + 81)$
${3}^{n} \times 121$
${3}^{n} \times 11 \times 11$
sigur divizibil cu 11