Question

If a matrix has 5 elements, write all possible orders it can have.

Answer 1

We know that if a matrix is of order $m\times n,\mathrm{then}\mathrm{it}\mathrm{has}mn\mathrm{elements}.$

If the matrix has 5 elements, then the number of elements will be 1$\times$5 or 5$\times$1, i.e. there will be 2 possible orders of the matrix.