Question

Encontre o termo geral da P.A (2,5,...)

Answer 1

$an = a1 + [(n - 1)r]$
$an = 2 + [(n - 1)(3)]$
$an = 2 + 3n - 3$
$an = -1 + 3n$

Answer 2

an = a1 + (n - 1) x r

an = 2 + (n - 1) x 3
an = 2 + 3n - 3
an = -1 + 3n