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What Is the Dimension of the Matrix A=[298467]A = \left[ \begin{array} { c c c } 2 & - 9 & 8 \\4 & 6 & - 7\end{array} \right]

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What is the dimension of the matrix
A=[298467]A = \left[ \begin{array} { c c c } 2 & - 9 & 8 \\4 & 6 & - 7\end{array} \right]
The dimension of the matrix is _______ x _______\_\_\_\_\_\_\_\text { x }\_\_\_\_\_\_\_ .

What is the value of the element b21b _ { 21 }
b21=_______b _ { 21 } =\_\_\_\_\_\_\_

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