If text R = left begin array 20 c 1&0& -...

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If \[{\text{R}} = \left[ {\begin{array}{*{20}{c}} 1&0&{ - 1} \\ 2&1&{ - 1} \\ 2&3&2 \end{array}} \right],\] then top row of R^-1 is

A. [5 6 4]

B. [5 -3 1]

C. [2 0 -1]

D. \[\left[ {\begin{array}{*{20}{c}} 2&{ - 1}&{\frac{1}{2}} \end{array}} \right]\]

Answer: Option B

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