e. Each elementary matrix is invertible. A product of invertible x n matrices is invertible, and the inverse of the product is the product of their inverses in the same order.

b. If A is invertible, then the inverse of A¹ is A itself. e. If A = [] and ad = be, then A is not invertible. d 10. a. d. If A can be row reduced to the identity matrix, then A must be invertible. e. If A is invertible, then elementary row operations that