Question

quantos termos a PA (3,7,11,15,...,199) possui?​

Answer 1

Progressão Aritmética

$a_n=a_1+(n-1)\cdot r$

$199=3+(n-1)\cdot4$

$199=3+4n-4$

$199=-1+4n$

$199+1=4n$

$200=4n$

$\boxed{\boxed{n=50 }}$