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

A. $a^{3} + b^{3} + 3 a b (a + b)$
B. $a^{3} + b^{3} + 3 a b (a + b)$
C. $a^{3} + b^{3} + 3 a b (a + b)$
D. $a^{3} + b^{3} + 3 a b (a + b)$

Answer: Option A

Explanation:

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