ISRO Electrical Engineering (EE) 2020 - Question 51

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A is an (m × n) matrix with m > n and 'I' is identity matrix. Let A1 = (A^T A)^-1 A^T, then which of the following statement is false?

  • A. A A1 A = A
  • B. (A A1)^2 = A A1
  • C. A A1 = I
  • D. A1 A A1 = A1

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