Bissoy.com
Doctors Medicines MCQs Q&A

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

1 Answers

Option 3 : PQ = I and QP = I

Given, P = Q-1

Post multiply by Q

PQ = Q-1Q (we know Q-1Q = I)

PQ = I

Similary, pre-multiply by Q

QP = QQ-1

QP = I (QQ-1 = I)

So, PQ = I and QP = I
4 views

Related Questions