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Mathematics · 2024 · 1 mark
CBSE 2024 · Region 5 · Set 1 · Q2
If A = [a, c, -1; b, 0, 5; 1, -5, 0] is a skew-symmetric matrix, then the value of 2 a -( b + c ) is:
If $\displaystyle \mathrm{A}=\left[\begin{array}{ccc}\mathrm{a} & \mathrm{c} & -1 \\ \mathrm{~b} & 0 & 5 \\ 1 & -5 & 0\end{array}\right]$ is a skew-symmetric matrix, then the value of $\displaystyle 2 \mathrm{a}-(\mathrm{b}+\mathrm{c})$ is :
Official answer
(A)
$\displaystyle 0$
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CBSE Class 12 Mathematics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.