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U3 ar² 2
r^3 =27
r =∛27 = 3
lalu, ar^² = 2
a(3)² = 2
a = 2/9
U4 = ar^3 =2/9 x (3)^3 =2/9 x 27 = 6
U₄ = ar³
U₄ =
U₄ =
U₄ =