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suku ke 9 = 9 x 5 -3 = 42
suku ke 15 = 15 x 5 - 3 = 72
U6 = 5(6)- 3 = 30-3= 27
U9 = 5(9)- 3 = 45-3= 42
U15 = 5(15) - 3 = 75-3= 72