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Let first and second row vectors of matr...

Let first and second row vectors of matrix A be `vecr_1=[1,1,3] and vecr_2=[2,1,1]` and let the third row vector be in the plane of `vecr_1 and vecr_2` perpendicular to `vecr_2` with magnitude `sqrt5,` then which of the following is/are true? [`Not : Tr.(P)` denote trace of matrix P.]

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