Question 628447
{{{C[23]}}} would be the element in the second row and third column of C. This element will be the result of multiplying the second row of A:
{{{(matrix(1, 4, 1, -3, 0,3))}}}
times the third column of B:
{{{(matrix(4, 1, 1, 0, 3, 1))}}}<br>
So
{{{C[23] = 1*1 + (-3)*0 + 0*3 + 3*1 = 1 + 0 + 0 + 3 = 4}}}