### Home > A2C > Chapter 7 > Lesson 7.3.5 > Problem 7-221

7-221.

If

*M*is as shown below, find a matrix*I*such that*MI*=*IM*=*M*, or write “impossible” and explain why. Homework Help ✎

Notice that this matrix is not a square.

Remember that there can only be one 1 in each column and row, and the rest of the numbers are zero.

See part (b).