Question

o número de múltiplos de 8 Entre 50 e 1206 é​

Answer 1

Resposta:

$$\begin{lgathered}a_{n}=a_{1}+(n-1)\cdot{r}\\\end{lgathered}$$

$$\begin{lgathered}1204=56+(n-1)\cdot{7}\\\end{lgathered}$$

$$\begin{lgathered}1204=56+7n-7\\\end{lgathered}$$

$$\begin{lgathered}1204-56+7=7n\\\end{lgathered}$$

$$\begin{lgathered}7n=1155\\\end{lgathered}$$

$$\begin{lgathered}n=\frac{1155}{7}\\\end{lgathered}$$

$$\boxed{n=165}$$

Espero ter ajudado :)