Posted by OIan on Tuesday, April 16, 2013 at 3:27am.
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?

Maths  Steve, Tuesday, April 16, 2013 at 11:12am
C =
(9 6 8)
(7 8 9)
(14 10 13)
so add 'em up