is the element at the intersection of the second row of the matrix A and its third column, counting from left to right.


Read the label at the second row.


Read the label at the third column.


This question is for a kindergarten alumni.

A mnemonic device for remembering which subscripts are which, is to think of
the word "arc" which reminds you of

Ar,c or Arow,column

If you need a mnemonic device for remembering which is a row and which is a
column, think of columns on a mansion or building.  They go up and down,
vertically, whereas rows go across, left to right, horizontally.

Edwin