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Ke-3
Ke-4
ke-5 240
ke-6
ke-7 ???
Suku ke 5 - suku ke 2 : 3
240 - 30 : 3
210 : 3 = 70
satu Loncatan di +70
Suku ke 7 = 240 + (2x70) = 240 + 140 = 380