In an upper triangular matrix \( A=\left[a_{i j}\right]_{\mathrm{n}...

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In an upper triangular matrix \( A=\left[a_{i j}\right]_{\mathrm{n} \times \mathrm{n}} \) the elements \( \mathrm{a}_{\mathrm{ij}} \) \( =0 \) for
\( \mathrm{P} \)
(1) \( ij \)
(2) \( i=j \)
W.
(3) \( ij \)
(4) \( i \leq j \)
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