Question

In the det. $\left| \begin{matrix} 7 & 1 & - 2 \ 8 & 0 & - 1 \

• 3 & 2 & - 4 \end{matrix} \right|$the value of C₂₃ is-

• A. 17
• B. –17
• C. 15
• D. –12

Answer 1

Answer: (B)

–17

Answer 2

C₂₃ = (–1)²⁺³ $\left| \begin{matrix} 7 & 1 \

• 3 & 2 \end{matrix} \right|$= – (14 + 3) = –17