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${(a + b)}^{3} = ?$

a^{3} + b^{3} + 3 a b (a + b)

a^{3} + 3 a^{2} b + 3 a b + b^{3}

a^{3} + 3 a b + 3 a b^{2} + b^{3}

a^{3} + b^{3} - 3 a b (a + b)

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