If c and d are matrices and c is the inverse of d, which of the following is true?

4) CD =DC = 1  is true .

Step-by-step explanation:

Given  : If C and D are matrices and C is the inverse of D.

To find  :  which of the following is true.

Solution : We have given that  C and D are matrices and C is the inverse of D.

By the inverse matrix rule  : = 1" alt="A^{-1} A^{}" />= 1" />.

Where is inverse of A matrix .

Then CD =DC = 1

Therefore, 4) CD =DC = 1  is true .