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Verified answer
Segitiga I = 3 lidiSegitiga II = 9 lidi
Segitiga III = 18 lidi
9-3 = 6
setiap pola ditambah 3, contoh: (6, 9, 12, 15, 18, 21)
pola 1 = 3+6 = 9
pola 2 = 9+9 = 18
pola 3 = 18+12 = 30
pola 4 = 30+15 = 45
pola 5 = 45+18 = 63
pola 6 = 63+21 = 84
pola 7 = 84
Jadi, pola ke-7 adalah 84