lf the order of A is 4 × 3, the order of B is 4 × 5 and the order of C is 7 × 3, then the order of (A^TB)^T C ^T is

Question

Question

Answer 1

Concept:

To multiply an m × n matrix by an n × p matrix, the n must be the same, and the result is an m × p matrix.
If A be a matrix of order m × n than the order of transpose matrix is n × m

Calculation:

Given:

Order of A is 4 × 3, the order of B is 4 × 5 and the order of C is 7 × 3

The transpose of the matrix obtained by interchanging the rows and columns of the original matrix.

So, order of A^T is 3 × 4 and order of C^T is 3 × 7

Now,

A^TB = {3 × 4} {4 × 5} = 3 × 5

⇒ Order of A^TB is 3 × 5

Hence order of (A^TB)^T is 5 × 3

Now order of (A^TB)^T C ^T = {5 × 3} {3 × 7} = 5 × 7

∴ Order of (A^TB)^T C ^T is 5 × 7