Tolong yaa pake cara

U2 = 10
10 = a r

U6 = 160
160 = a r^5

ar^5 / ar = 160 / 10
r^4 = 16
r = 2

10 = a . r
10 = a . 2
a = 5

U10 = a r^n - 1
U10 = 5 2^9
U10 = 5 (512)
U10 = 2560

(C)