1.
2. Not possible
3.
4.
1. AB does not exist and BA exists
2. AB exists and BA does not exist
3. AB, BA exist and are not equal
4. AB, BA exist and equal
AB, BA exist and are not equal
1. 4A
2. 3A
3. 2A
4. A
2A
1.
2. A
3. I
4. Null matrix
Null matrix
1. 8A
2. 4A
3. 32I
4. 16A
8A