If \( A=\left[\begin{array}{ccc}0 & a & b \\ 7 & 0 & c \\ -1 & -6 &...

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If \( A=\left[\begin{array}{ccc}0 & a & b \\ 7 & 0 & c \\ -1 & -6 & 0\end{array}\right] \) is skew symmetric matrix
\( \mathrm{P} \)
W
then the value of \( a b c \) is equal to
(1) 42
(2) -42
(3) 49
(4) -49
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