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Un = U1 x r^n-1
U2 = U1 x r^1 = 10
U6 = U1 x r ^5 = 10
U2 / U6 = 10/10
U1 x r / U1 x r^5 = 1 ...(Hilangkan U1)
r / r^5 = 1
1 / r^4 = 1 / 1 ...(Kali silang)
r^ 4 x 1 = 1
r^4 = 1
r = 1
U2 = U1 x r
10 = U1 x 1
U1 = 10.
U9 = U1 x r^8
U9 = 10 x (1)^8
U9 = 10 x 1
U9 = 10