Out of the following a skew-symmetric matrix is \( \mathrm{P} \) (1...

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Out of the following a skew-symmetric matrix is
\( \mathrm{P} \)
(1) \( \left[\begin{array}{ccc}0 & 4 & 5 \\ -4 & 0 & -6 \\ -5 & 6 & 0\end{array}\right] \)
(2) \( \left[\begin{array}{ccc}1 & 4 & 5 \\ -4 & 1 & -6 \\ -5 & 6 & 1\end{array}\right] \)
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(3) \( \left[\begin{array}{ccc}1 & 4 & 5 \\ -4 & 2 & -6 \\ -5 & 6 & 3\end{array}\right] \)
(4) \( \left[\begin{array}{ccc}i+1 & 4 & 5 \\ -4 & i & -6 \\ -5 & 6 & i\end{array}\right] \)
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