Question

Escreva o termo geral da p.a (1/2,5/2,9/2,...)

Answer 1

$a1 = \frac{1}{2} \\ r = 2 \\ \\ an = a1 + (n - 1) \times r \\ an = \frac{1}{2} + (n - 1) \times 2 \\ an = \frac{1}{2} + 2n - 2 \\ an = 2n - \frac{3}{2}$