Evaluate $2 \times 2$ Determinant $$\left| \begin{array} { c c } - 3 & 1 \\9 & 7\end{array} \right|$$

question 216

Multiple Choice

Evaluate $2 \times 2$ determinant. $$\left| \begin{array} { c c } - 3 & 1 \\9 & 7\end{array} \right|$$

• A) -30
• B) -20
• C) 20
• D) 30

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