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Calculate the size of a square matrix (n × n) where the elements are present at (i + j) ≥ n + 1

what is the size of a matrix? is it not n^2

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I m not  exactly clear what u mean here by size of the matrix but no of elements present at any time would be

$\frac{N(N+1)}{2}$-1  if we take starting index to be 1 of i,j.

put N=3 we get 5 elements which are (2,2) (2,3) (3,1) (3,2) (3,3) similarly it holds for N=4 and above !

But above all the matrix size would be N*N

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samarpita asked May 9, 2022
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Eigen Values of an orthogonal matrix will always be +1 and the modulus will also be always |1|? I have a doubt on this point .