Question

Determine o termo geral da P.A. (2, 5, 8, ...)"

A) 2n +1

B) 2n-1

C) 3n-1

D) 3n + 1

E) 30​

Answer 1

$\Large\boxed{\begin{array}{l}\sf r=5-2=3\\\sf a_n=a_1+(n-1)\cdot r\\\sf a_n=2+(n-1)\cdot3\\\sf a_n=2+3n-3\\\sf a_n=3n-1\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~C}}}}\end{array}}$