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Verified answer
Bab Pola BilanganMatematika SMP Kelas VII
suku ke 1 = 12 = 15 - 3 x 1
suku ke 2 = 9 = 15 - 3 x 2
suku ke 3 = 6 = 15 - 3 x 3
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suku ke n = 15 - 3n