Question

The matrix P is the inverse of a matrix Q. If I denotes the identity matrix, which one of the following options is correct?

• A. PQ=I but QP ≠ I
• B. QP=I but PQ ≠ I
• C. PQ=I but QP=I
• D. PQ-QP = I

Answer 1

Answer: (C)

PQ=I but QP=I

Answer 2

The correct answer is(C): PQ=I but QP=I