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1. (a + b)³ ↪ 1 . 3 . 3 . 1
= a³ + 3a²b + 3ab² + b³
2. (a + b)⁴ ↪ 1 . 4 . 6 . 4 . 1
= a⁴ + 4a³b + 6a²b² + 4ab³ + b⁴