Question

Das sequencias abaixo quais sao PG. respostas a) ( 4,12,36,108,...) b) ( -2,8-32,128,...) c) (3,9,15,21,...) d) ( 1,-1,1,-1,1,...)

Answer 1

a) q = a2/a1 = 12/4 = 3

b) q = a2/a1 = - 8/2 = - 4

c) q = - 1

Answer 2

as sequências a (q=3), b (q=-4), d (q=-1)