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In a third order matrix A, a(ij) denotes...

In a third order matrix A, `a_(ij)` denotes the elements in the i-th row j-th column. If `{(a_(ij)= 0 , i=j),(a_(ij)= 1 , igtj),(a_(ij)= -1 , iltj):}`
Then the matrix is

A

skew symmetric

B

symmetric

C

not invertible

D

non-singular

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