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suku 2 = 81
suku 3 = 27
suku 4 = 9
suku 5 = 3
suku 6 = 1
suku 7 = 1/3
suku 8 = 1/9
jadi jawabnya c. 1/9
2. 36 . 6,6 + 4 . x / 40 = 6,8
237, 6 + 4x / 40 = 6,8
237,6 + 4x = 6,8 . 40
237,6 + 4 . x = 272
4x = 272 - 237,6
4x = 344
x = 8,60
jadi, nilai rata rata susulan 4 siswa adalah b. 8,60