Question

Let A,B and C be matrices such that
A=(1 2
3 1
2 3)
,
B=(1 2 2
4 2 3) and C=AB.

What is the sum of all the elements (entries) of matrix C?

Answer 1

C =
(9 6 8)
(7 8 9)
(14 10 13)

so add 'em up