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= [(1 + 12)]²
= (6 . 13)²
= 84²
= 7056
aturan penjumlahan bil asli berpangkay 3 berurutan adalah
atau ....
1³ + 2³ = (1 + 2)² = 3² = 9
1³ + 2³ + 3³ = (1 + 2 + 3)² = 6² = 36
dst .......