JEE PYQ: Matrices And Determinants Question 53
Question 53 - 2020 (08 Jan Shift 1)
The number of all $3 \times 3$ matrices $A$, with entries from the set ${-1, 0, 1}$ such that the sum of the diagonal elements of $AA^T$ is $3$, is ______.
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The number of all $3 \times 3$ matrices $A$, with entries from the set ${-1, 0, 1}$ such that the sum of the diagonal elements of $AA^T$ is $3$, is ______.