Question

If $I_3$ is the identity matrix of order 3, then $I^{-1}_3$ is

• A. 0
• B. $3 I_3$
• C. $I_3$
• D. Does not exist

Answer 1

Answer: (C)

$I_3$

Answer 2

As $I_3 I_3 = I_3$, thesefore $I^{-1}_3 = I_3$