Fundamentholfundamenthol
JEE Main2019Math
Q.

If A is a symmetric matrix and B is a skew-symmetric matrix such that A + B = \left[ {\begin{array}{*{20}{c}} 23 \\ 5{ - 1} \end{array}} \right] , then AB is equal to : 

  1. A

    \left[ {\begin{array}{*{20}{c}} 4{ - 2} \\ 1{ - 4} \end{array}} \right]\,

  2. B

    \left[ {\begin{array}{*{20}{c}} 4{ - 2} \\ { - 1}{ - 4} \end{array}} \right]

  3. C

    \,\left[ {\begin{array}{*{20}{c}} { - 4}{ - 2} \\ { - 1}4 \end{array}} \right]

  4. D

    \left[ {\begin{array}{*{20}{c}} { - 4}2 \\ 14\end{array}} \right]

Solution

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