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Let A and B be 3×3  real matrices such that A is symmetric matrix and B is skew-symmetric matrix. Then the system of linear equations  A2B2B2A2X=0, where X is a  3×1 column matrix of unknown variables and O is a  3×1 null matrix, has

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a
a unique solution
b
infinitely many solutions
c
no solution
d
exactly two solutions

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detailed solution

Correct option is B

Given AT=A,        BT=-B         given system is homogenous system of equationsDeterminant of coefficient matrix  is A2B2−B2A2Consider A2B2−B2A2T=A2B2)T−(B2A2T =B2A2-A2B2 =-A2B2−B2A2Therefore, A2B2−B2A2 is a skew symmetric matrix of odd orderHence the determinant of the coefficient matrix is zero. Therefore, the system of equations have non trivial solutions, and it has infinitely many solutions


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