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Verified answer
Barisan Geometri72, -24, 8, ...
a = 72
r = -24/72 = -1/3
U10 = ar^9
U10 = 72 . (-1/3)^9
U10 = -8 . 3^2 . 3^-9
U10 = -8 . 3^-7
U10 = -8/2187