Question

Bantuin ya. Makasihhh

Answer 1

U4 = 1
ar^n-1 = 1
ar^3 = 1
a = 1/r^3
U8 = 1/256
ar^7 = 1/256 . lalu substitusikan a = 1/r^3
1/r^3 x r^7 = 1/256
r^4 = 1/256
r = 1/4

U3 = ar^2 = 1/r^3 x r^2 = 1/r = 1/1/4 = 4
koreksi ya kalo ada yg salah. semoga membantu ^^