. How many 3 × 3 matrices M with entries from {0, 1, 2} are there,
How many 3 × 3 matrices M with entries from {0, 1, 2} are there, for which the sum of the diagonal entries of MT M is 5?
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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 entries of MT M is 5?