Question

Qual o decimo setimo termo da PA (-6,-1,4,...)

Answer 1

a(17)=a(1)+[17-1]*R
a(17)= -6 +16*R

R=a(2)-a(1)=-1- -6=5
a(17)= -6 +16*5
a(17)=74

Answer 2

an = a1 + (n-1) r 

an = -6 + (17- 1) 5

an = -6 + (16) 5

an = - 6 + 80

an =  74 resposta

{-6  -1    4   9  14  19   24  29  34  39  44  49   54   59   64   69   74 }