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The non-zero determinant is not divisible by three (Posted on 2023-06-12) Difficulty: 3 of 5
A variation of The determinant is divisible by three.

In a 10*10 matrix 91 of the entries are 1's and the other 9 entries are either 0's or 2's.

Prove (not by simulation) that if the value of the determinant of the above matrix is nonzero then it is not divisible by 3.

See The Solution Submitted by Brian Smith    
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