Question

Quantos termos tem PA (15,30,…,1665)?

Answer 1

Resposta:

$\textsf{Leia abaixo}$

Explicação passo a passo:

$\mathsf{a_n = a_1 + (n - 1)r}$

$\mathsf{1.665 = 15 + (n - 1)15}$

$\mathsf{1.665 = 15 + 15n - 15}$

$\mathsf{15n = 1.665}$

$\mathsf{n = \dfrac{1.665}{15}}$

$\boxed{\boxed{\mathsf{n = 111}}}$