Question

Encontre o termo geral da P.A. (13, 17, 21...). *

3 pontos

A) An = 4n+ 6

B) An= 5n+6

C) An = 4n+ 9

D) An= 5n+ 9

E) An= 5n+ 2​

Answer 1

$> resolucao \\ \\ \geqslant progressao \: aritmetica \\ \\ r = a2 - a1 \\ r = 17 - 13 \\ r = 4 \\ \\ \\ an = a1 + (n - 1)r \\ an = 13 + (n - 1)4 \\ an = 13 + 4n - 4 \\ an = 4n + 9 \\ \\ resposta \: > \: letra \: ( \: \: c \: \: ) \\ \\ > < > < > < > < > < > < > > >$