Matrix Diagonal Sum Count (Jee Mains) | ExamDuo
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Permutations
Hard
Matrix Diagonal Sum Count
Let
S
be the set containing all
3
×
3
matrices with entries from
{
−
1
,
0
,
1
}
. The total number of matrices
A
∈
S
such that the sum of all the diagonal elements of
A
T
A
is 6 is ________.
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