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If A=[a(i j)] is a skew-symmetric matrix...

If `A=[a_(i j)]` is a skew-symmetric matrix, then write the value of `sum_i a_(i j)dot`

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`Given : A= [a_{i j}]` is a skew symmetric matrix.
`Rightarrow a_{i j}=-a_{j i}` [ For all values of i, j ]
`Rightarrow a_{i i}=-a_{i i}` [ For all values of i ]
`Rightarrow a_{i j}=0`
Now,
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