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How many 3×3 matrices M with entries from {0, 1, 2} are there, for which the sum of the diagonal

How many 3×3 matrices M with entries from {0, 1, 2} are there, for which the sum of the diagonal entries of MᵀM is 5?
[A] 126 [B] 198 [C] 162 [D] 135

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Видео How many 3×3 matrices M with entries from {0, 1, 2} are there, for which the sum of the diagonal канала Om Sharma Sir : Pearson Author | IIT Bombay
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