Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Linear Algebra Matrix Algebra

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

1
PQ = I but QP ≠ I
2
QP = I but PQ ≠ I
3
PQ = I and QP = I
4
PQ – QP = I
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