$A=\left[\begin{array}{ccccccc}4& -2& 3& 1& 6& 2& 2\end{array}\right]$

$1$

$1$

$-2,B=\left[\begin{array}{ccccccc}1& -3& 0& 1& 0& 0& -2\end{array}\right]$

$0$

$-3$

$C=\left[\begin{array}{cccc}0& 1& 2& 0\end{array}\right]$

$-2$

$3,a=\left[\begin{array}{ccc}1& -2& 0\end{array}\right],b=\left[\begin{array}{c}3\end{array}\right]$

$1$

$-1.$

Showing all intermediate results, calculate the following expressions or give reasons

why they are undefined: ABC,ABa,ABb,$C{a}^T$