Matrices & Determinants · JEE Main previous year questions

2014 1 question

1. Q122014 · 6 Apr 2014 · Shift 1

   If $A$ is a $3\times 3$ non-singular matrix such that $A{A}^{\prime }=A^{\prime }A$ and $B=A^{-1}{A}^{\prime }$, then $B{B}^{\prime }$ equals:

   1. A.$B^{-1}$
   2. B.$(B^{-1}{)}^{\prime }$
   3. C.$I+B$
   4. D.$I$
   Show answer

   Answer: D