Question

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

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

Answer 1

Answer: (C)

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