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pola 1 = 1 atau 1 = 1²
pola 2 = 3 + 1 atau 4 = 2²
pola 3 = 5 + 3 + 1 atau 9 = 3²
................
pola 12 = 23 + 21+ 19 + 17+ 15+ 13+ 11+ 9+ 7+5+3+1
atau 144 = 12²
D.144
2)
bilangan 1 - 25 terdapat bilangan ganjil 13
1+3+5+7+9+11+13+15+17+19+21+23+25 = 169 (13 bilangan ganjil)
atau 13² = 169
B.169
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