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What is the minor of a23 in \begin{vmatrix} 1 & 3 & 5\\ 8 & 2 &1 \\ 5& 6 & 10 \end{vmatrix} ?

  • Option 1)

    9

  • Option 2)

    -9

  • Option 3)

    6

  • Option 4)

    -6

 

Answers (1)

best_answer

As we have learnt,

 

Minor of an element of a determinant -

- wherein

In general minor  M_{ij}  of an element a_{ij}  is the determinant excluding the i^{th} row and j^{th} column

 

 minor = \begin{vmatrix} 1 & 3\\ 5& 6 \end{vmatrix}= 6 -15 = -9

 


Option 1)

9

Option 2)

-9

Option 3)

6

Option 4)

-6

Posted by

prateek

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