jelasin pake cara ya

Rasio = U5 - U3 = 162 / 18
U2 = 9
R = √9
R = 3
U1 = 18 / 9
U1 = 2
U9 = 2 . ([tex] 3^{9-1} [/tex])
U9 = 2 . 3⁸
U9 = 2 . 6561
U9 = 13.122 (A)

smoga membantu ^_^

U3 = 18
U5 = 162
U9 = ......?

r^5-3 = 162 : 18 = 9
r^2 = 9
r = 3

U3 = 18 = ar^2 = 9a
a = 2

U9 = a(r^9-1)
= 2(3^8)
= 2(6561)
= 13122

jadi jawabannya adalah (A). 13.122