Question

Determinar a razão da p.a (2/3,7/6,5/3...) Quero saber o Cálculo certo. ?

Answer 1

an=a1+(n-1).r
5/3=2/3+(3-1).r
5/3=2/3+2r
2r=5/3-2/3
2r=3/3
2r=1
r=1/2
r=0.5