**2* 2 matrix multiplication of three matrices**

(WIKIPEDIA)

The order of the matrices A, B and C is 2*2.

The multiplication of the matrices A and B is denoted by the matrix E.

The multiplication of the matrices A, B and C is denoted by the matrix D.

Procedure: the first element of the first row of the first matrix is multiplied with the first element of the first row of the second matrix. This is added to the product of second element of the first row of the first matrix and the second element of the first column of the second matrix. The above step is continued to calculate the other elements of the resultant matrix.