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I = 1
II = 1+3
III = 1+3+5
Pola ke-15
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29 = 225
Semoga membantu^^
pola II = 1 +3 = 4
Pola III = 1 + 3+5 = 9
Pola ke 15 = 1 +3 +5+7+9+11+13+15+17+19+21+23+25+27+29 = 225
jadi pola ke 15 segitiga sama sisi nya berjumlah 225. jadi jawabannya d.225