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Show that if a square matrix A has 2 equal columns, then A is not invertible
[From: ][author: ][Date: 12-10-19][Hit: ]
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Prove the above. Thanks! First good answer gets best answer points.
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inverse requires to multiply by 1/determinate (1/(ad-bc))
a b
c d
if columns are the same
a a
b b
ab-ab
0
1/0
1
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