If Aland Bare 9 times 7 matrices and C is a 3 times 9 matrix

If Aland Bare 9 times 7 matrices, and C is a 3 times 9 matrix, which of the following are defined? A^T C^T B - C CB A^T AB B - A

Solution

If A and B are 9x7 matrices and C is a 3x9 matrix then which of the following are defined?

Answer is (A) A^tC^t because after taking transpose both A and C because conformal hence it will be defined.