Choose the correct options for the following questions.
If A and B are two matrices of order 2*3 and 3*1, respectively then A+B=
Difficulty: Easy
A:
BA
B:
AB
C:
Not possible
D:
0
Given matrix A of order m*n, then A+(-A)=
Difficulty: Easy
A:
0
B:
A
C:
-A
D:
2A
If A and B are two matrices of order B*B then AB=A iff
Difficulty: Easy
A:
B=I
B:
B=A
C:
$B=A^{2}$
D:
$B-B^{2}$
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