3 1
4
B=
1
2
A=
5
3
A. AB =
11
29
4
11
B. AB=
2
12
3
10
a
C. AB =
6
15
1
8
D. AB =
17
27
4
14

A

Step-by-step explanation:

Sum the product of the components in the first row of A with the corresponding components of the first column in B

Repeat this with the components in the second row of A with the corresponding components of the second column in B, that is

AB

=

=

=

=  → A

what is the original number? you forgot to add it.