If a 2 x 7 matrix is multiplied to a 7x5 matrix, and then the result is multiplied to a 5 x 11 matrix, what is the size of the final result

1.

Let A be a m*n matrix, and B be a n*k matrix,

then A * B is a matrix of size m*k,

2.

in the given problem:

Multiplying a 2 x 7 matrix by a 7x5 matrix, results in a 2 x5 matrix,

multiplying this matrix by a 5 x 11 matrix, then results in a 2*11 matrix.

Answer: 2*11