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  5. \(\begin{vmatrix} -2...

\(\begin{vmatrix} -2 & 1 & 1 \\ 2 & 1 & k \\1 & 3...

Mathematics
JAMB 1995
\(\begin{vmatrix} -2 & 1 & 1 \\ 2 & 1 & k \\1 & 3 & -1 \end{vmatrix}\) = 23
  • A. 1
  • B. 2
  • C. 3
  • D. 4
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Correct Answer: Option B
Explanation
-2(-1 - 3k) - 1(-2 -k) + 1(6 - 1) = 23

7k = 14

k = 2
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