The matrix P is the inverse of a matrix Q If...

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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 = $$I$$ and QP = $$I$$

D. PQ - QP = $$I$$

Answer: Option C

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