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U4 = 375
a . r^3 = 375
3 . r^3 = 375
r^3 = 375:3
r^3 = 125
r^3 = 5^3
r = 5
U6 = a . r^(n-1)
U6 = 3 . 5^(6-1)
U6 = 3 . 5^5
U6 = 3 . 3125
U6 = 9375