Question

determine o numero de termos da P.A 1,4,7...298

Answer 1

$P.A (1,4,7...298)\\\\ a_{1} =1\\ r=3\\ a_{n} =298\\ n=?\\\\\\ a_{n} = a_{1} +(n-1)*r \\\\\\ 298= 1 +(n-1)*3 \to \\\\298= 1 +3n-3 \to \\\\ 298-1+3=3n\to\\\\ 300=3n\to \\\\ \frac{300}{3} =n\to \\\\ n=100$

Answer 2

Olá!

a1=1
an=298
r=3 (7-4=3)
n=?

an=a1+(n-1)r
298=1+(n-1)3
298=1+3n-3
298-1+3=3n
300=3n
300/3
|100|

Resposta:100 termos!

Espero ter ajudado! =)