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Please,please help me Which of these can be a diagonal element in a square matrix with 6 elements and 6 rows ?

Which of these can be a diagonal element in a square matrix with 6 elements and 6 rows ? 

  • Option 1)

    a_{31}

  • Option 2)

    a_{77}

  • Option 3)

    a_{22}

  • Option 4)

    a_{15 }

 
Answers (1)
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As we have learned

Leading / principal diagonal of a matrix -

Diagonal from left hand side upper corner to the lower most element.

- wherein

 

 For a diagonal element a_{ij}; i= j

 


Option 1)

a_{31}

Option 2)

a_{77}

Option 3)

a_{22}

Option 4)

a_{15 }

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