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U3 = ar²
U5 = ar⁴
U5 / U3 = 405 / 45
ar⁴ / ar² = 9
r² = 9
r = √9
r = 3
ar² = 45
a(3)² = 45
9a = 45
a = 45/9
a = 5
U9 = ar^8
= 5(3)^8
= 5(6561)
= 32.805
---> C.