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Find value of 2a + 3b − c, if \(A=\begin{bmatrix}0&-1&28\\a-8&0&3b\\-c+2&2&0\end{bmatrix}\) is a skew-symmetric matrix.

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a − 8 = 1 

⇒ a = 9

3b = −2

⇒ b = − 2/3

−c + 2 = −28

⇒ c = 30

⇒ 2a + 3b − c = − 14

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