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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
^ = pangkat
r = ^(3 - 1)√(U3/U1)
r = ²√(12/27)
r = √(4/9)
r = 2/3
U4 = U3 . r
U4 = 12 . 2/3
U4 = 8 tahun