Create a matrix A with $25$ rows, $2$ columns, and all entries equal $1.$

$($b$)$ Reassign the first column of A so that the entry in the kth row and first column is: $2$k$.$

That is$,$ the

row k$,$ column $1$

$-$entry of A is reassigned to $2$k for k $=1,2,3,,25$