Let \( A \) be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of \( \mathrm{A}^…
Q1
Let \( A \) be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of \( \mathrm{A}^{2} \) is 1 , then the possible number of such matrices is:
[JEE Main 2021, 26 Feb (Shift 1)]
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