If A is a square matrix of order 3 and A' denotes transpose of matrix A, A'A=I, and det A=1, then det(A-I) must be equal to 

ans=0
  • -9
Here the unknown matrix A will be I matrix only....then only it will satisfy the given conditions. Hence answer is 0✌️
  • 1
Prabhash is correct
  • -2
Prabhash ranjan is correct
  • 0
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