Solve this following

Show that the matrix $A=\left[\begin{array}{ccc}0 & \mathrm{a} & \mathrm{b} \\ -\mathrm{a} & 0 & \mathrm{c} \\ -\mathrm{b} & -\mathrm{c} & 0\end{array}\right]$ is skew-symmetric.

HINT: Show that $A^{\prime}=-A$.