Question

Determinar o termo geral da PA (10,7,4,1,-2,-5).

Answer 1

R = a2-a1
R = 7-10
R = -3

An = a1+(n-1).r
An = 10+(n-1).(-3)
An = 10+(-3n+3)
An = 10-3n+3
An = 13 - 3n