Question

Diketahui U3 = 20 U6 = 160
U8 ?

Answer 1

kalau geometri
u6/u3 = ar^5/ar^2
160/20 = r^3
8 = r^3
r = 2
ar^2 = 20
a(2)^2 = 20
4a = 20
a = 5
U8 = ar^7
  = 5(2)^7
 = 5(128)
=640