The sum of all the diagonal elements of a matrix A -

Options :
  1. Is equal to the product of eigen values
  2. is always less than |A|
  3. is always greater than |A|
  4. is equal to the trace of A


Answer and Explanation :-

Answer: Option 4

Explanation:

By definition, Trace of a square matrix = Sum of its diagonal elements = Sum of all its eigen values

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