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प्रश्न
If A and B non-singular matrix then, which of the following is incorrect?
विकल्प
A2 = I implies A-1 = A
I-1 = I
If AX = B then X = B-1A
If A is square matrix of order 3 then |adj A| = |A|2
उत्तर
If AX = B then X = B-1A
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