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Determine divisibility (Posted on 2014-09-29) Difficulty: 2 of 5
If I tell you that each of the four numbers 1242,1426,2070,and 1564 is divisible by 23(trust me!), could you with no explicit calculation prove that the determinant of the 4x4 matrix
1 2 4 2
1 4 2 6
1 5 6 4
2 0 7 0
is also divisible by 23?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
SolutionSolutionHarry2014-10-02 19:39:27
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