If A is symmetric as well as skew symmetric matrix, then A is

Let A = [aij]Since A is skew-symmetric,∴ aii = 0 and aij = –aji (i ≠ j)A is symmetric as well, so aij = aji for all i and j.∴ aij = 0 for all i ≠ jHence, aij = 0 for all i and j i.e. A is a null matrix.