# Find $$b$$ by $$a$$

$\begin{array}{cccc} & \color{red}A & \color{red}A & \color{red}A \\ \times & & & \color{red}A \\ \hline 3 & \color{blue}B & \color{blue}B & \color{red}A \end{array}$

What is $${\color{blue}B}?$$

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