Answer
\begin{array}{rl}{b\ \ \ 1} & {1} & {1} & {b} \\ {} & {\uparrow} & {} \\ {} & {3}\end{array}
Work Step by Step
\begin{array}{rl}{b\ \ \ 1} & {1} & {1} & {b} \\ {} & {\uparrow} & {} \\ {} & {3}\end{array}
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