![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Multiplication of two matrices possible if the number of columns in the
\first matrix equals the number of rows in the second matrix.
\The dimensions of the matrix C are ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9337ef936ed673bb0d4991e95255ff3a.png\")
and the number of columns in
the matrix C is 4.
\The dimensions of the matrix D are ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f441a7a982f732c9053d2a0fee73c612.png\")
and the number of the rows in the matrix Y is 5.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
The number of columns in the matrix C is not equals the number
\of rows in the matrix D.
\So, matrix product CD is impossible.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The matrix product CD is impossible.